JP2009251262A - Image display, image display system, and method for controlling the image display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an image display capable of easily storing contents of image display to read them again. <P>SOLUTION: The image display includes an image signal processing part 141 for generating an output image signal on the basis of an input image signal, a display part 160 for displaying an image on the basis of the output image signal, a control unit 120 for controlling the operation of the image signal processing part 141, a storage part 150 for storing image data, and an image signal output part 170 for outputting an image signal to the outside of the image display. The control unit 120 stores, after receipt of an operation signal to store contents of an image displayed by the display part from an operation signal processing part 112, image data corresponding to the contents of the output image signal in the storage part 150, and obtains, after receipt of an operation signal to output image data stored in the storage part 150, the image data stored in the storage part 150 to output an image signal corresponding to its contents from the image signal output part 170. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image display device that displays an image corresponding to an input image signal, a control method thereof, and an image display system including a plurality of the image display devices.

  Conventionally, regarding an image display system, Japanese Patent Application Laid-Open Publication No. 2004-228561 discloses a technique for “providing a flexible image display system that can easily change a scenario of a presentation” as “an image display device is in order. Has a card interface to which a memory card for storing image data having a predetermined screen is mounted, converts the image data into an analog RGB signal, and transmits the analog RGB signal to a liquid crystal projector. The control data and the image data are received from the computer, the image data is read from the memory card, and the received image data is converted into an analog RGB signal (summary). ).

  In addition, regarding an image display system, Japanese Patent Application Laid-Open Publication No. 2004-228867 discloses that when a presentation is performed using an image display device such as a projector, a presenter who receives a question from a listener receives an image related to the question while listening to the question. As a technology whose problem is “must be searched and displayed”, “a plurality of images supplied from an external device are sequentially displayed on the image display device 1 for displaying an image supplied from the external device 13 such as a personal computer”. In response to receiving the identification information from any of the plurality of identification information transmitters 10 capable of transmitting unique identification information, the identification information and the identification information are displayed when the identification information is received. The image specifying information for the image that has been stored is associated with each other and stored in the storage means 6, and the image specifying information stored in the storage means is stored in the storage means 6. Ri the image specified by again supplied to the external device, the image associated with the specific information provided control means 5 for re-displayed with the stored identification information. "Those that have been proposed (abstract).

Japanese Patent Laid-Open No. 10-333870 JP 2002-351434 A

  In the technique described in Patent Document 1, it is possible to read out image data from a memory card and send it to a liquid crystal projector. However, it is necessary to store the image data in the memory card in advance, which requires time and effort. .

In the technique described in Patent Document 2, the identification information transmitter 10 is required for each listener who makes a question, and the cost is likely to increase.
In addition, unless the image display contents that can identify individual images by identification information, for example, a presentation that identifies individual slides by page numbers, individual images are identified using the identification information transmitter 10. It cannot be specified.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an image display device that can easily execute the process of storing and reading out the image display contents.

An image display device according to the present invention is an image display device that displays an image corresponding to an input image signal, an image signal input unit that receives the input image signal, and an image that generates an output image signal based on the input image signal. A signal processing unit, a display unit for displaying an image based on the output image signal, a control unit for controlling the operation of the image signal processing unit, a storage unit for storing image data, and an image signal of the image display device. An image signal output unit that outputs to the outside, and an operation signal processing unit that outputs an operation signal corresponding to the operation content to the control unit, and the control unit displays the display unit from the operation signal processing unit. When the operation signal indicating that the content of the image being stored should be saved is received, the image data corresponding to the content of the output image signal is stored in the storage unit, and the image data stored in the storage unit should be output Effect Upon receiving the operation signal, an image signal corresponding to the content to acquire the image data in which the storage unit is storing output from the image signal output unit.
Therefore, it is not necessary to prepare image data to be output from the image signal output unit in advance, which is preferable from the viewpoint of user operability.

In the image display device according to the present invention, the control unit stores image data corresponding to the content of the output image signal in the storage unit when the input image signal or the output image signal does not change for a predetermined time. To do.
For this reason, images that are continuously displayed and are considered to be highly important are automatically stored in the storage unit, so that the user's operation procedure is simplified.

The image display device according to the present invention includes a plurality of the image signal input units, and the control unit receives the operation signal indicating that the image signal input unit to be used should be switched from the operation signal processing unit. Image data corresponding to the content of the output image signal is stored in the storage unit, and one of the plurality of image signal input units is selected and the image signal received by the image signal input unit is stored in the image signal processing unit. Output.
Therefore, the image displayed before the input switching is automatically stored in the storage unit, so that the user's operation procedure is simplified.

The image display device according to the present invention further includes a second storage unit that stores image data corresponding to the content of the image displayed by the display unit, and the control unit inputs an image signal to the image signal input unit. Is interrupted, the image data stored in the second storage unit is acquired and stored in the storage unit.
Therefore, the image displayed immediately before the input image signal is interrupted is automatically stored in the storage unit, so that the user can easily confirm this.

The image display apparatus according to the present invention includes a projection unit that projects an image based on the output image signal as the display unit.
Therefore, the image display device according to the present invention can be used as a projector having the same function as described above.

An image display system according to the present invention includes a plurality of the image display devices according to any one of the above, and connects the image signal output unit and the image signal input unit included in another image display device, The image display device displays an image corresponding to the input image signal to the image display device.
Therefore, it is possible to construct an image display system that displays the output image signal output from the image signal output unit on another image display device.

The image display apparatus control method according to the present invention stores an image signal processing unit that generates an output image signal based on an input image signal, a display unit that displays an image based on the output image signal, and image data. A method for controlling an image display device comprising: a storage unit; and an image signal output unit that outputs an image signal to the outside of the image display device, wherein the content of the image displayed on the display unit is stored A step of receiving an operation signal indicating power, a step of storing image data corresponding to the content of the output image signal in the storage unit, and an operation signal indicating that the image data stored in the storage unit should be output. And receiving the image data stored in the storage unit and outputting an image signal corresponding to the content from the image signal output unit.
Therefore, the image display device can be controlled so that it is not necessary to prepare image data to be output from the image signal output unit in advance. Thereby, the effect similar to the above can be exhibited.

Embodiment 1 FIG.
FIG. 1 is a functional block diagram of an image display apparatus 100 according to Embodiment 1 of the present invention.
The image display device 100 is a device that displays an image corresponding to an input image signal, and includes an operation panel 111, an operation signal processing unit 112, a control unit 120, an image signal input unit 130, an image signal processing unit 141, a frame memory 142, A storage unit 150, a display unit 160, and an image signal output unit 170 are provided.

The operation panel 111 is provided on the outer surface of the main body housing of the image display device 100, and is used to receive user operation information. The operation panel 111 includes a screen save key and a screen output key described later with reference to FIG.
When the user presses a key disposed on the operation panel 111, an operation signal corresponding to the key is output to the operation signal processing unit 112.
The operation signal processing unit 112 receives the operation signal output from the operation panel 111, performs processing such as conversion to a digital signal, and outputs the digital signal to the control unit 120.

The control unit 120 controls the operation of the image signal processing unit 141.
Further, image data to be described later is stored in the storage unit 150, or the image data stored in the storage unit 150 is read, and an image signal corresponding to the image data is output from the image signal output unit 170 to the outside of the image display device 100. To output.
The control unit 120 can be configured by hardware such as a circuit device that realizes the function, or can be configured by an arithmetic device such as a microcomputer or a CPU (Central Processing Unit) and a control program that defines the operation thereof. You can also.

The image signal input unit 130 receives an input image signal output from an external device such as a computer, performs processing such as conversion to a digital image signal if it is an analog image signal, and outputs it to the image signal processing unit 141.
The format of the input interface may be arbitrary, but it is conceivable to employ a technique such as using an image input terminal or transmitting / receiving image data by data communication means.

The image signal processing unit 141 stores image data corresponding to the input image signal from the image signal input unit 130 in the frame memory 142 for each frame (one screen) and reads out the image data stored in the frame memory 142. A digital output image signal is generated based on the input image signal and an instruction from the control unit 120 and output to the display unit 160.
The image signal processing unit 141 is configured by a microprocessor or the like, and performs the above processing by executing a built-in program.

The storage unit 150 stores image data to be described later. The format of the image data may be arbitrary as long as the control unit 120 can interpret it. For example, a standard image format such as JPEG or BMP is convenient for processing.
The storage unit 150 can be configured by a writable storage device such as an HDD (Hard Disk Drive) or a flash ROM (Read Only Memory).

The display unit 160 includes, for example, a liquid crystal display device, and receives an output image signal from the image signal processing unit 141 and displays the image on the screen.
The image signal output unit 170 receives the output image signal from the image signal processing unit 141, and outputs the output image signal to the outside of the image display device 100.
The format of the output interface of the image signal output unit 170 may be arbitrary as with the image signal input unit 130. However, in consideration of connecting a plurality of image display devices 100 in series as will be described later with reference to FIG. 3, it is convenient to use an interface of the same format as the image signal input unit 130.

FIG. 2 is an external view of the image display device 100.
A pedestal that supports the display unit 160 is provided below the display unit 160, and an operation panel 111 to an image signal output unit 170 are provided inside or on the surface of the pedestal.

FIG. 3 is a diagram illustrating a configuration example of the image display system according to the first embodiment.
In FIG. 3, the image display devices 100a to 100b have the configuration described with reference to FIGS. Hereinafter, the components included in the image display devices 100a and 100b are distinguished by using subscripts a and b, respectively.
Further, the image signal input unit 130 and the image signal output unit 170 are connected as follows. The connection method is matched with the input / output interfaces of the image signal input unit 130 and the image signal output unit 170.

(1) The image signal input unit 130a included in the image display device 100a receives an input image signal output from the computer 200.
(2) The image signal output unit 170a included in the image display device 100a outputs an output image signal.
(3) The image signal input unit 130b included in the image display device 100b receives the output image signal output from the image signal output unit 170a as an input image signal.
(4) The image signal output unit 170b included in the image display device 100b displays an image corresponding to the input image signal received by the image signal input unit 130b on the display unit 160b and outputs it as an output image signal as it is.

As shown in FIG. 3, an image signal output unit 170 of the image display device 100 and an image signal input unit 130 of another image signal device 100 are connected in series to display the same image on a plurality of display units 160. An image display system can be constructed.
The number of connection stages of the image display device 100 is not limited, but in the following description, a configuration in which two image display devices 100 are connected in series is used from the viewpoint of simplicity of description.

The configuration of the image display device 100 and the image display system has been described above.
Next, the operation of each image display apparatus 100 will be described assuming a scene in which a presentation is performed under the configuration of FIG.

FIG. 4 is a diagram illustrating a flow of a screen displayed by each image display device 100 when a presentation is performed using the image display system described with reference to FIG.
Hereinafter, an operation performed by each image display apparatus 100 as the presentation progresses to steps (1) to (7) in FIG. 4 will be described.

(1) The presenter connects the image display apparatuses 100a to 100b and the computer 200 as described with reference to FIG. Next, the presenter operates the computer 200 to output an input image signal representing the content of the presentation to the image signal input unit 130a of the image display device 100a.
The image signal processing unit 141a of the image display device 100a receives the input image signal output from the computer 200 from the image signal input unit 130a, generates an output image signal, and performs screen display via the display unit 160a. The output image signal is output to the image display device 100b via the image signal output unit 170a.
The image signal input unit 130b of the image display device 100b receives the output image signal output from the image signal output unit 170a as an input image signal. Thereafter, the display unit 160b displays the same screen as the display unit 160a by the same processing procedure as that of the image display device 100a.

(2) The presenter presses a screen save key provided in the operation panel 111a of the image display device 100a in a state where each image display device 100 performs the display as in step (1). The operation signal processing unit 112a outputs an operation signal to that effect to the control unit 120a.
The control unit 120a acquires image data corresponding to the latest output image signal from the frame memory 142a, and stores the image data in the storage unit 150a. As a result, the contents of the image displayed on the display unit 160a at that time are stored in the storage unit 150a.

(3) The presenter proceeds with the presentation by operating the computer 200 to switch slides. As the process proceeds, the image display devices 100a and 100b execute the same process as in step (1), and the contents of the images displayed by the display units 160a and 160b change.

(4) The presenter presses a screen output key provided in the operation panel 111a of the image display device 100a. The operation signal processing unit 112a outputs an operation signal to that effect to the control unit 120a.
The control unit 120a reads the image data stored in step (2) from the storage unit 150a, and causes the image signal output unit 170a to output the image data through the image signal processing unit 141a. The image data may be directly output from the control unit 120a to the image signal output unit 170a.

(5) The presenter advances the presentation by operating the computer 200 to switch slides. As the process proceeds, the image display device 100a executes the same process as in step (1), and the content of the image displayed on the display unit 160a changes.
However, since the image signal processing unit 141a outputs the image data stored in the storage unit 150a instead of the output image signal from the image signal output unit 170a, the image displayed on the display unit 160b of the image display device 100b is displayed. Unlike the image displayed on the image display device 100a, the image data is stored in the storage unit 150a.

(6) The presenter presses a screen output key provided in the operation panel 111a of the image display device 100a. The operation signal processing unit 112a outputs an operation signal to that effect to the control unit 120a.
The control unit 120a cancels the operation of causing the image signal output unit 170a to output the image data read from the storage unit 150a.

(7) The presenter proceeds with the presentation by operating the computer 200 to switch slides. As the process proceeds, the image display devices 100a and 100b execute the same process as in step (1), and the contents of the images displayed by the display units 160a and 160b change.

In the foregoing, the flow of the screen displayed by each image display device 100 when performing a presentation using the image display system described with reference to FIG. 3 has been described.
According to the flow of FIG. 3, the presenter can control the display content of the image display device 100b only by operating the screen save key and the screen output key, and can smoothly advance the presentation.

As described above, in the image display apparatus 100 according to the first embodiment, the display content of the display unit 160 is stored in the storage unit 150 by a simple operation of pressing the screen save key, and the screen output key is further pressed simply. This can be read out by a simple operation and output from the image signal output unit 170 to the outside of the image display device 100.
As a result, it is not necessary to prepare image data to be output from the image signal output unit 170 in advance, and it is sufficient to press the screen save key when an image that seems to be important is displayed on the display unit 160. From the viewpoint of operability.

In the image display system according to the first embodiment, the image signal output unit 170a of the image display device 100a and the image signal input unit 130b of the image display device 100b are connected in series.
As a result, when an important image that is likely to be of interest to the listener is displayed, the contents can be saved by pressing the screen save key and easily displayed again on the image display device 100b. Therefore, the presenter can easily present the image to the audience when receiving a question later, which is convenient for both the presenter and the audience.

Embodiment 2. FIG.
In the first embodiment, the configuration and operation of pressing the screen save key provided in the operation panel 111 and storing the image displayed on the display unit 160 at that time as image data in the storage unit 150 have been described.
In the second embodiment of the present invention, a configuration and operation for storing an image displayed on the display unit 160 as image data in the storage unit 150 in response to another event will be described.

  The “second storage unit” in the claims corresponds to the frame memory 142 in the second embodiment.

FIG. 5 is a functional block diagram of the image display apparatus 100 according to the second embodiment.
The image display apparatus 100 according to the second embodiment includes a new input switching unit 180 in addition to the configuration described in FIG. 1 of the first embodiment. Moreover, the three image signal input parts 131-133 are provided. Since other configurations are substantially the same as those of the first embodiment, the description will focus on the differences.

Each of the image signal input units 131 to 133 has a function of receiving an input image signal and outputting it to the input switching unit 180. In the input interface, all of the image signal input units 131 to 133 may be the same, or all may be different.
The input switching unit 180 selects any one of the image signal input units 131 to 133 based on an instruction from the control unit 120, and outputs the image signal received by the image signal input unit to the image signal processing unit 141. .
The operation panel 111 includes operation means for performing an operation input indicating that the input switching unit 180 should perform a switching operation, for example, an input switching key. When the operation means is operated, an operation signal to that effect is output to the control unit 120 via the operation signal processing unit 112, and the control unit 120 executes a switching operation of the input switching unit 180 according to the operation signal.

The configuration of the image display device 100 according to the second embodiment has been described above. Next, the operation of the image display apparatus 100 according to the second embodiment will be described.
In the image display apparatus 100 according to the second embodiment, in addition to when the user presses the screen save key, the display unit 160 is triggered by an event described in (1) to (3) below. The displayed image is stored in the storage unit 150 as image data.

(1) When the same image continues for a predetermined time The frame memory 142 has a storage area for several screens. The image signal processing unit 141 monitors the image data stored in the frame memory 142, compares successive screens, detects that there is no change in the image, and outputs the result to the control unit 120.
When the same image data is continuously stored in the frame memory 142 for a predetermined time, the control unit 120 acquires the image data and stores it in the storage unit 150.
The fact that the same image data is continuously stored in the frame memory 142 means that the content of the image data is continuously displayed on the display unit 160, and as such is displayed continuously. It can be assumed that the image to be played is an important image with a high degree of attention from the listener.
Therefore, when the monitoring result as described above is obtained, the image data is stored in the storage unit 150 so that it can be easily read out and displayed on the display unit 160 later.
Note that “the image in the frame memory 142 has not changed” means that the input image signal or the output image signal has not changed, but it is determined as appropriate to determine whether or not there is a change. That's fine.

(2) When input switching is performed When the control unit 120 causes the input switching unit 180 to perform switching operation, the control unit 120 acquires the image data stored in the frame memory 142 immediately before and stores it in the storage unit 150. To do.
When the input switching is performed, the image displayed on the display unit 160 before that can no longer be viewed. Therefore, in order to check what image was displayed immediately before the input switching, the input switching is performed again. To return to the state before switching.
Therefore, in order to simplify this operation, when the input switching unit 180 performs input switching, the control unit 120 acquires image data from the frame memory 120 and stores it in the storage unit 150 for display immediately before switching. The image displayed by the unit 160 can be easily read and displayed again.

(3) When the input image signal cannot be detected When the input image signal supplied from the image signal input units 131 to 133 cannot be detected, the image signal processing unit 141 notifies the control unit 120 to that effect.
The control unit 120 acquires the newest valid image data from the storage areas for several screens of the frame memory 142 at that time, and stores them in the storage unit 150.
If the input image signal cannot be detected, the image displayed on the display unit 160 before that cannot be viewed.
Therefore, when the input image signal cannot be detected, the control unit 120 acquires the image data from the frame memory 120 and stores it in the storage unit 150, and easily reads out the image displayed on the display unit 160 immediately before. Enabled to be displayed again.

As described above, the events (1) to (3) serving as a trigger for storing the image displayed on the display unit 160 as image data in the storage unit 150 have been described.
Assuming that the image data stored in the storage unit 150 is only one, the stored image depends on the order in which the events (1) to (3) and the screen save key press event are detected. Data contents are different.
That is, since the image displayed on the display unit 160 at the time of the last detected event is finally stored in the storage unit 150, the event that should be given the highest priority may be detected last.

  FIG. 6 is an operation flow of the image display apparatus 100 according to the second embodiment. Here, an example is shown in which the screen save key press event is detected last, but the order of event detection described above is not limited to this. Hereinafter, each step of FIG. 6 will be described.

(S601)
The user turns on the image display apparatus 100.
(S602)
The control unit 120 starts a timer using a built-in clock function or the like.
(S603)
The control unit 120 determines whether the screen output key is pressed based on the operation signal output from the operation signal processing unit 112. When it is pressed, the process proceeds to step S604, and when it is not pressed, the process proceeds to step S605.

(S604)
The control unit 120 executes the following processing. The image signal processing unit 141 outputs an output image signal based on the instruction.
(1) When the image signal processing unit 141 outputs the output image signal to the image signal output unit 170, the image signal corresponding to the image data stored in the storage unit 150 is output instead of the image signal. The image signal processing unit 141 is instructed to output to the unit 170.
(2) When the image signal processing unit 141 corresponds to the image data in the storage unit 150 but outputs an image signal, the output image signal corresponding to the input image signal is sent to the image signal output unit 170 instead. The image signal processing unit 141 is instructed to output.

(S605)
The control unit 120 determines whether or not the input switching key has been pressed based on the operation signal output from the operation signal processing unit 112. When the button is pressed, the process proceeds to step S606. When the button is not pressed, the process proceeds to step S608.
(S606)
The control unit 120 acquires the image data stored in the frame memory 120 and stores it in the storage unit 150.
(S607)
The control unit 120 causes the input switching unit 180 to perform switching.

(S608)
The image signal processing unit 141 notifies the control unit 120 of a detection result as to whether or not a valid input image signal is supplied from the image signal input units 131 to 133.
Based on the notification, the control unit 120 determines whether a valid input image signal is supplied from the image signal input units 131 to 133. If it is supplied, the process proceeds to step S610, and if not supplied, the process proceeds to step S609.
(S609)
The control unit 120 acquires image data in which a valid image is recorded among the image data currently stored in the frame memory 142 and stores it in the storage unit 150.

(S610)
The control unit 120 determines whether the image data stored in the frame memory 142 has changed from the image data of the previous frame via the image signal processing unit 141. If it has changed, it will progress to step S615, and if it has not changed, it will progress to step S611.
(S611)
The control unit 120 determines whether or not a predetermined time has passed without changing the image data stored in the frame memory 142, using the elapsed time of the timer activated in step S602.
If the predetermined time has elapsed, the process proceeds to step S612, and if not, the process proceeds to step S613.

(S612)
Since it is the same as step S606, description is abbreviate | omitted.
(S613)
The control unit 120 determines whether or not the screen save key is pressed based on the operation signal output from the operation signal processing unit 112. When the button is pressed, the process proceeds to step S614. When the button is not pressed, the process proceeds to step S615.
(S614)
Since it is the same as step S606, description is abbreviate | omitted.
(S615)
When the operation of the image display apparatus 100 is finished, the control unit 120 finishes this operation flow, and when not finished, the control unit 120 returns to step S602 and repeats the same processing.

  The operation flow example of the image display apparatus 100 according to the second embodiment has been described above.

As described above, in the image display device 100 according to the second embodiment, in addition to the operations described in the first embodiment, a plurality of trigger events for storing the image displayed on the display unit 160 in the storage unit 150 are provided. Provided.
As a result, as described in the trigger events (1) to (3), an image that seems to have a high importance level is automatically stored in the storage unit 150, so that the user's trouble of pressing the screen save key is reduced. Thus, it is possible to provide the image display device 100 with good usability.

Embodiment 3 FIG.
FIG. 7 is a functional block diagram of the image display apparatus 100 according to Embodiment 3 of the present invention.
The image display apparatus 100 according to the third embodiment projects an image instead of the display unit 160 configured by the liquid crystal display or the like described in FIG. 1 of the first embodiment as a function unit that displays an image. A projection unit 190 is provided.
Since other configurations are substantially the same as those of the first embodiment, the third embodiment will be described focusing on the differences. Note that a projection unit 190 may be provided instead of the display unit 160 in the configuration described in the second embodiment.

  The projection unit 190 appropriately includes a configuration necessary for image projection such as a light source, a light modulation element, and a projection optical system, receives an output image signal from the image signal processing unit 141, and projects the image onto the screen 200. As the light modulation element, a liquid crystal light valve, a micromirror array device, or the like is used.

As described above, the image display device 100 according to the third embodiment has a function equivalent to that of the image display device 100 described in the first and second embodiments, and is a projector that projects an image corresponding to an input image signal. Can be used.
That is, as an image display method, in addition to the screen display described in the first and second embodiments, a variation of projecting the image can be provided.

  In the first and second embodiments, an example in which an image display system is constructed by connecting a plurality of image display devices 100 has been shown, but the image display device 100 according to the third embodiment is similarly connected, An image display system that projects the same image on a plurality of screens 200 can also be constructed.

  Further, in the first and second embodiments, the example in which the display image is switched by pressing the screen save key or the screen output key provided in the operation panel 111 has been described. It can also be provided and used.

2 is a functional block diagram of the image display apparatus 100 according to Embodiment 1. FIG. 1 is an external view of an image display device 100. FIG. 1 is a diagram illustrating a configuration example of an image display system according to Embodiment 1. FIG. It is a figure which shows the flow of the presentation using an image display system. 6 is a functional block diagram of an image display device 100 according to Embodiment 2. FIG. 6 is an operation flow of the image display apparatus 100 according to the second embodiment. 6 is a functional block diagram of an image display device 100 according to Embodiment 3. FIG.

Explanation of symbols

  100 image display device, 111 operation panel, 112 operation signal processing unit, 120 control unit, 130 image signal input unit, 141 image signal processing unit, 142 frame memory, 150 storage unit, 160 display unit, 170 image signal output unit, 180 Input switching unit, 190 projection unit.

Claims (7)

An image display device that displays an image corresponding to an input image signal,
An image signal input unit for receiving an input image signal;
An image signal processing unit for generating an output image signal based on the input image signal;
A display unit for displaying an image based on the output image signal;
A control unit for controlling the operation of the image signal processing unit;
A storage unit for storing image data;
An image signal output unit for outputting an image signal to the outside of the image display device;
An operation signal processing unit that outputs an operation signal corresponding to the operation content to the control unit;
With
The controller is
When an operation signal indicating that the content of the image displayed on the display unit is to be stored is received from the operation signal processing unit, image data corresponding to the content of the output image signal is stored in the storage unit,
When an operation signal indicating that the image data stored in the storage unit should be output is received, the image data stored in the storage unit is acquired and an image signal corresponding to the content is received from the image signal output unit. An image display device characterized by output. The controller is
When the input image signal or the output image signal does not change for a predetermined time,
The image display device according to claim 1, wherein image data corresponding to the content of the output image signal is stored in the storage unit. A plurality of the image signal input units,
The controller is
When an operation signal indicating that the image signal input unit to be used should be switched is received from the operation signal processing unit,
Storing image data corresponding to the content of the output image signal in the storage unit;
3. The image display device according to claim 1, wherein one of the plurality of image signal input units is selected and an image signal received by the image signal input unit is output to the image signal processing unit. . A second storage unit for storing image data corresponding to the content of the image displayed by the display unit;
The controller is
When the supply of the input image signal to the image signal input unit is interrupted,
The image display device according to any one of claims 1 to 3, wherein the image data stored in the second storage unit is acquired and stored in the storage unit. As the display unit,
The image display apparatus according to claim 1, further comprising a projection unit that projects an image based on the output image signal. A plurality of image display devices according to any one of claims 1 to 5,
Connecting the image signal output unit and the image signal input unit included in another image display device;
An image display system, wherein each image display device displays an image corresponding to an input image signal to the image display device. An image signal processing unit for generating an output image signal based on the input image signal;
A display unit for displaying an image based on the output image signal;
A storage unit for storing image data;
An image signal output unit for outputting an image signal to the outside of the image display device;
A method for controlling an image display device comprising:
Receiving an operation signal indicating that the content of the image displayed by the display unit should be stored;
Storing image data corresponding to the content of the output image signal in the storage unit;
Receiving an operation signal to output the image data stored in the storage unit;
Obtaining image data stored in the storage unit and outputting an image signal corresponding to the content from the image signal output unit;
A control method for an image display device, comprising:

Images