JPH11341403A - Multi-screen display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain display of a normal video image and to simplify the installation and adjustment by applying mobile display control of an execution display position to each screen. SOLUTION: Each of projectors (11, 12,...n) being components of the multi- screen display device is provided with a circuit shown in the figure. A signal processing circuit 23 changes display resolution of an input video signal under the control of a control section 27 and processes the signal so as to display a video image of a smaller range than a total display range depending on number of total pixels of a liquid crystal display panel 25. That is, the execution display range to actually display a video image is limited within a total display range, then the video image is movable within the total display range. Then the control section 27 based on an operation of the user controls to change a phase of a horizontal/vertical scanning start reference pulse that is given to a panel drive circuit 24. Since the displayed video image is easily moved, a normal video image without deviation of display is displayed by properly operating a corresponding projector and the installation and the adjustment are simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video projector having an image display function (hereinafter abbreviated as "projector").
More particularly, the present invention relates to a multi-screen display device capable of correcting a display shift of an image when the image is enlarged and displayed by a simple display position control.

[0002]

2. Description of the Related Art In recent years, with the increase in the screen size of an image display device,
2. Description of the Related Art A projector provided with an image display function of displaying an image based on an input signal by enlarging and projecting the image on a screen such as a screen is drawing attention.

As such a projector, for example, a projector that displays an image formed on a liquid crystal panel by enlarging and projecting it on a screen or the like, or that emits image light of three primary colors from a projection tube to form an image on a screen, is displayed. There is a method of the method. Such an image display device can be freely selected in accordance with the purpose of use of the user, and can also be displayed on a large screen. Therefore, the demand for the image display device is large and the image display device is widely used.

[0004] Such an image display device includes a rear projection type television receiver used in ordinary homes,
Front projection type projectors and the like are well known, but in addition,
For example, multi-screen display devices have also been put into practical use for corporate advertising, etc., or for display of various events.
Future demand is expected.

[0005] The multi-screen display device is configured by combining a plurality of projectors. For example, a large system such as 9 or 16 projectors may be configured by combining a set of 100 projectors.

For example, a multi-screen display device configured by combining nine projectors is shown in FIG.
A system as shown in FIG. That is, the multi-screen display device 10 is configured by combining sets of nine video projectors 11 to 19 in the horizontal and vertical directions as shown in the figure.

Each set of the projectors 11 to 19 has a display processing function for enlarging and projecting an image based on an input video signal on a screen and displaying the enlarged image. Although not shown, each is provided with a connector. Communication cables are connected to these connectors, which can be used to supply power to each set, transmit video signals to be displayed, or transmit data such as control data required for system control via these communication cables. I have to.

In the multi-screen display device having such a configuration, one image can be enlarged and displayed, for example, by dividing one image and displaying the divided images by the respective projectors.

By the way, in such a multi-screen display device, in order to magnify and display one normal image, a connection portion of images displayed by adjacent projectors is extremely important. In particular, let alone brightness, hue,
If the image display size and display position are not uniform, an unnatural image will result.

For example, as shown in FIG. 4, a case where a projector 20 is used as one image and a perfect circle 20 is displayed in the display area of the corresponding screen 15a, 16a, 18a, 19a. Assume that At this time, each projector 18, 19 is
Assuming that the installation position of the projector 18 is shifted from the initial installation of the projector, as shown in FIG.
The position of 9a is also changed, and as a result, the images displayed on these screens are not aligned with other images, that is, they are not perfect circles and are distorted images. Such a phenomenon becomes more noticeable as the size of the screen increases.

As a cause of such a phenomenon, an installation error of each projector, a division error of a circuit section for dividing a video signal, and the like can be considered. Therefore, in order to correct such a phenomenon, it is necessary to adjust the installation state of each projector, finely adjust the display position of each projector, and the like. In particular, the system is constructed as one system by combining a set of 100 projectors. Large systems can be very difficult to adjust and require more people and time.

However, in the conventional multi-screen display device, there is a problem that the adjustment accompanying the displacement of the display position cannot be simplified.

[0013]

As described above, in the conventional multi-screen display device, if the display positions of the adjacent projectors are shifted, it is impossible to display connected normal images. To fix this,
Fine adjustments are required for each projector, but these adjustments are complicated and difficult, and the number of people and time required for the adjustments increase, and as a result, the adjustments cannot be simplified. There was a point.

In view of the above, the present invention has been made in view of the above-mentioned problems. By enabling the movement display control of the execution display position with respect to each screen, it is possible to display a normal image and to simplify the adjustment. It is an object of the present invention to provide a multi-screen display device capable of achieving the following.

[0015]

According to a first aspect of the present invention, there is provided a multi-screen display device comprising: a projector having a liquid crystal panel and a projection unit for projecting an image displayed on the liquid crystal panel onto a screen; In a multi-screen display device configured by combining a plurality of the plurality of projectors, the plurality of projectors include an input terminal to which a video signal is supplied and an image within a second range smaller than a first range determined by a total number of pixels of the liquid crystal panel. Signal processing means for processing the video signal so as to display, and driving means for driving the liquid crystal panel based on the video signal processed by the signal processing means and displaying a video within the second range, Display position changing means for changing a display start position of the liquid crystal panel and making a displayed image movable within the first range. And it is characterized in and.

The multi-screen display device according to the first aspect of the present invention is configured as one system by combining a plurality of projectors having a liquid crystal panel, and the plurality of projectors are arranged based on a total display range determined by the number of pixels of the liquid crystal panel. An input video signal is processed so as to display a video in a small range, and a liquid crystal panel is driven by the processed video signal. Further, by controlling the phase of the timing signal given to the drive circuit, the display start position of the video can be arbitrarily changed.

[0017]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a multi-image display apparatus according to the present invention, showing a circuit configuration incorporated in each video projector configured as a system. FIG. 1 shows an example of a circuit configuration in one projector in a system including a plurality of projectors for simplification of description.

The multi-screen display device of the present embodiment is constructed by combining a plurality of projectors in the horizontal and vertical directions similarly to the multi-screen display device shown in FIG. A circuit group capable of controlling the display position of the image signal and controlling the signal processing of the input video signal is incorporated. With these circuit groups, the position can be easily adjusted when the display position is shifted. ing.

The overall configuration is the same as that of FIG. 4. For example, a system configuration is formed by combining nine projectors. As shown in the figure, each set of nine video projectors 11 to 19 is Combined in horizontal and vertical directions.

Each of these sets of projectors 11 to 19 has a display processing function for enlarging and projecting an image based on an input video signal onto a screen and displaying the enlarged image. Although not shown, each is provided with a connector. Communication cables are connected to these connectors, which can be used to supply power to each set, transmit video signals to be displayed, or transmit data such as control data required for system control via these communication cables. I have to.

The circuit shown in FIG. 1 will be described in detail. An input terminal 21 for inputting a video signal is provided, and a video signal input via the input terminal 21 is given to a synchronization signal detection circuit 22. When one image is divided and displayed in an enlarged manner by each projector, a video signal obtained by dividing one image is supplied to the input terminal 21 by a system controller (not shown). I have.

The synchronizing signal detecting circuit 22 separates the synchronizing signal from the supplied video signal. The synchronizing signal is supplied to the signal processing circuit 23, and the synchronizing signal is supplied to the timing generating circuit 26.
Give to.

The signal processing circuit 23 performs signal processing on the supplied video signal according to the display method of the liquid crystal panel under the control of the control unit 27 described later. Specifically, conversion processing is performed on the input signal so that the image is displayed within a display range narrower than the display range determined by the total number of pixels of the liquid crystal display panel 25. As an example of the conversion processing, it is conceivable to change a sampling clock frequency when sampling a video signal.

For example, if the number of pixels of the liquid crystal display panel 25 is
When the input video signal has a resolution corresponding to XGA (1024 horizontal pixels × 768 vertical pixels), the input video signal is
SVGA less than that of A (800 horizontal pixels × 6 vertical pixels)
Sampling processing is performed so that the signal has a resolution of (00 pixels). Thereby, the liquid crystal display panel 25
It is possible to display an image within a display range narrower than the total display range.

The output of the signal processing circuit 23 is supplied to a panel drive circuit 24. The panel drive circuit 24 is driven based on the supplied input image signal, and an image is displayed on the liquid crystal display panel 25. Also, the panel driving circuit 2
Reference numeral 4 indicates that the display start position of the video can be changed by the control unit 27, and the display position can be controlled.

On the other hand, a timing signal generation circuit 26 which has received a synchronization signal from the synchronization signal detection circuit 22 generates various timing signals necessary for driving the liquid crystal display panel 25 based on the input synchronization signal. This is given to the control unit 27.

The control unit 27 includes a timing signal generation circuit 2
Based on various timing signals from 6, the signal processing circuit 23 controls the conversion processing, the panel drive circuit 24 controls the display position, and controls the display of the liquid crystal display panel.

For example, an operation unit (not shown) for performing an input operation by a user is connected to the control unit 27, and the control unit 27 sends a signal so that an image smaller than the liquid crystal display panel 25 is displayed by the operation unit. It controls the processing circuit 23 to convert the video signal.

Further, when a shift occurs in the image displayed on the liquid crystal display panel 25, the control unit 27 similarly controls the timing signal generation circuit 2 based on an operation signal from the operation unit.
By controlling the phases of the horizontal and vertical scanning start reference pulses (start pulses) supplied from 6, the display position of the image can be moved. In this case, the control unit 27
Supplies a timing signal to the liquid crystal display panel 25 to control the synchronization between the pixel in the input video signal and the pixel of the liquid crystal display panel 25 to be displayed.

That is, the control unit 27 can control the change of the display range and the display position of the image in accordance with the operation of the operation unit by the user.

FIG. 2 is a diagram for explaining a display range of each projector in which the above-described circuit is incorporated. FIG. 2A is an explanatory diagram for explaining a display range on a liquid crystal panel, and FIG.
Shows cross-sectional views of the multi-screen display device.

As shown in FIG. 2A, the liquid crystal display panel 25 has a total display range 25A determined by the number of pixels. An image is displayed in the execution display range 25B, which is smaller than the display range 25A.

For example, the total number of pixels in the total display range 25A of the liquid crystal display panel 25 is 830 horizontal pixels × 620 vertical pixels, and an image is displayed in a smaller active display range 25B of 800 horizontal pixels × 600 vertical pixels. If the conversion processing is performed as described above, a non-display area 25C having 30 horizontal pixels and 20 vertical pixels is created. In this case, the control unit 27
Controls the non-display area 25C so as to be evenly interposed between the left, right, up, and down, thereby ensuring that the video execution display range 25B is within the total display range 2A.

Each projector capable of such display control is arranged at a predetermined distance from the screen 28 as shown in a sectional view of FIG. 2B, for example, and also in a horizontal direction. By being installed at the same distance, and accurately positioned and installed,
Multi-screen display device.

In the above multi-screen display device,
On the screen 28, as shown in FIG.
The light shielding plates 29a, 29b, 29c... 29n are provided so that enlarged projection lights from the respective projectors do not interfere with each other. In other words, the part shown by the broken line in the figure is the image of the total display range 25A projected from each projector,
The peripheral portions of these images are light shielding plates 29a, 29b, 29c ...
By blocking by 29n, only the image of the execution display range 25B is projected on the screen 28. At this time,
The non-display area 25c is between the dashed line and the solid line shown in the figure.

It should be noted that each projector does not actually project and display the entire video execution display range 25B on the screen 28, but is set so as to slightly overscan.

According to the above description, each projector constituting the multi-screen display device can display an image in the execution display range 25B smaller than the total display range 25A of the liquid crystal display panel 25.

Next, the operation at the time of adjusting the multi-screen display configured by combining a plurality of the projectors will be described in detail with reference to FIGS. FIG. 3 is an explanatory diagram for explaining a display position movement control operation by each control unit.

Now, in the multi-screen display device of the present invention, the display positions of the screens 18a and 19a by the projectors 18 and 19 are shifted as shown in FIG. 4, and this is corrected by the user.

In this case, in the projectors 15, 16, 18 and 19 for displaying the perfect circle 20, as described above, the execution display range 25B of the liquid crystal display panel 25 is as shown in FIG.
As shown in the figure, the image is displayed within the total display range 25A, and as a result, the image in the execution display range 25B can be moved within the total display range 25A.

While viewing the screen 18a or 19a in FIG. 4 where the display shift occurs, the user controls the corresponding projector using an operation unit (not shown) so that the display image with the display shift is connected to another display image. An operation signal for moving the display position is given to the unit 27.

Then, the control unit 27 recognizes the supplied operation signal, and controls the phase of the horizontal and vertical scanning start reference pulses from the timing generation circuit 26 based on the operation signal. The horizontal and vertical scanning start reference pulses are supplied to the panel drive circuit 24.

For example, in a normal state, the execution display range 25B is determined by the horizontal and vertical scanning start reference pulses 26a and 26b having the phases shown in FIG.
, For example, the horizontal scanning reference pulse 26
When the timing of the vertical scanning reference pulse 26d is advanced by delaying the timing of the vertical scanning reference pulse c, the panel driving circuit 24 causes the phase-adjusted horizontal and vertical scanning start reference pulses 26c and 26d to start.
By driving based on d, the display position of the execution display range 25B can be moved, and the execution display range 25b moved to the display position indicated by the broken line in FIG. 3 can be obtained.

In this case, the movement of the execution display range 25B is controlled by controlling the phase of the liquid crystal display panel 27 by the controller 27.
Is performed for one pixel, so that the display position can be moved for each pixel.

As described above, the user operates the projector 1
8 and 19 (see FIG. 4), by appropriately adjusting the display position so that the display image is in a normal display position, the corresponding screen 15a, 16a,
8a and 19a can be displayed as a normal perfect circle 20. For example, if the screen 18a in FIG. 4 is moved in the upper right direction and the screen 19a is moved in the upper left direction, a perfect circle can be displayed.

Therefore, according to the present embodiment, processing is performed so that an image is displayed in a range smaller than the total display range of the liquid crystal display panel 25, and the phases of the horizontal and vertical scanning reference pulses are controlled by the user. , It is possible to easily display an image at a desired position. As a result, it is possible to shorten a large adjustment time required at the time of installing each projector, which is conventionally required, and furthermore, a display operation performed by a plurality of personnel can be performed by a simple operation of a user. This also makes it possible to greatly simplify installation adjustment.

In the embodiment according to the present invention,
Although the number of projectors constituting the system is not mentioned, it is clear that the present invention can be applied to all systems including a plurality of projectors, and the same effects as described above can be obtained.

Further, in the present embodiment, the description has been made that the control of the display resolution conversion processing by the signal processing circuit is performed based on the operation signal from the user. However, the present invention is not limited to this. If the display resolution of the display panel is determined, the conversion processing may be performed so that the display resolution becomes smaller in advance. Also in this case, the same operation is performed and the same effect is obtained.

[0050]

As described above, according to the present invention,
By enabling movement control of the display position of an image on each of a plurality of screens, even if a display shift occurs in a part of the displayed image, normal image display can be performed by simple correction adjustment. This makes it possible to simplify the installation adjustment.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an embodiment of a multi-screen display device according to the present invention, and illustrating a configuration example of a circuit group incorporated in each projector.

FIG. 2 is an explanatory diagram for explaining a display range according to a display resolution conversion process by a signal processing circuit.

FIG. 3 is an explanatory diagram for explaining a display position control operation.

FIG. 4 is an explanatory diagram for explaining a problem of a conventional multi-screen display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Multi-screen display device, 11-19 ... Projector, 21 ... Input terminal, 22 ... Synchronous signal detection circuit, 23 ...
Signal processing circuit, 24 panel drive circuit, 25 liquid crystal display panel, 26 timing signal generation circuit, 27 control unit, 25A total display range, 25B execution display range, 25
C: No display area, 25b: Adjustable display range, 26a, 26
c: horizontal scanning start reference pulse, 26b, 26d: vertical scanning start reference pulse.

Claims (3)

[Claims] 1. A multi-screen display device comprising a combination of a plurality of liquid crystal panels and a projector having a projection means for projecting an image displayed on the liquid crystal panel onto a screen, wherein the plurality of projectors include: An input terminal to which a signal is supplied; signal processing means for processing the video signal so as to display a video within a second range smaller than a first range determined by the total number of pixels of the liquid crystal panel; Driving means for driving the liquid crystal panel based on the video signal processed by the processing means to display a video within the second range; and changing the display start position of the liquid crystal panel to the first video and displaying the video on the first display. And a display position changing means movable within a range of the multi-screen display device. 2. The apparatus according to claim 1, wherein said display position changing means comprises means for controlling a phase of a timing signal for instructing a start of horizontal / vertical scanning of said liquid crystal panel.
2. The multi-screen display device according to 1. 3. The projector according to claim 1, further comprising a shielding plate for preventing an image out of the second range from being projected on the screen from among the images projected from the projection unit. The multi-screen display device according to claim 1.