JP2008151838A - Multiple screen display device and method for adjusting display image - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiple screen display device having inconspicuous joints between respective image display devices when the multiple screen display device is constituted by combining a plurality of the image display devices, and a method for adjusting the display image of the multiple screen display device. <P>SOLUTION: The multiple screen display device is constituted of a plurality of projectors 101a to 101d having a plurality of light sources (LEDs) varying in luminescent colors and a controller 102. The controller 102 periodically monitors the luminance of the projectors 101a to 101d. The projectors 101a to 101d operate so as to maintain chromaticity, and if the target value of the luminance cannot be achieved in order to maintain the chromaticity, the projectors transmit the signal indicating a failure in achieving the target value to the controller 102. The target value of the fresh luminance is received from the controller 102 and the intensity of the light source of the projectors 101a to 101d is adjusted so as to attain the target value. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a multi-screen display device configured by combining a plurality of image display devices having a plurality of light sources having different emission colors, and more particularly to a multi-screen display device in which brightness and chromaticity of a display screen are adjusted and uniformed and the display thereof The present invention relates to an image adjustment method.

  Conventionally, by combining multiple image display devices and placing them in close contact on the same plane, the entire screen can be displayed as a large screen like a single screen, or different images can be displayed on each image display device. The device is used as a display for lectures, event venues, surveillance systems, and the like.

  In such a multi-screen display device, a plasma display panel (PDP), a liquid crystal display, a projection display (projector) or the like, which is a large screen display, is used as an image display device.

  In a multi-screen display device, when the brightness and chromaticity are different between the image display devices, the joints of the image display devices are clearly understood. Therefore, it is desirable to match the brightness and chromaticity between the image display devices as much as possible. Therefore, conventionally, a method has been proposed in which the average luminance level (APL) of an image display device is measured, transmitted to other image display devices constituting the multi-screen display device, and the level is aligned to suppress the luminance variation. (For example, refer to Patent Document 1).

Further, a method for adjusting the chromaticity of the image display device is disclosed (for example, see Patent Document 2).
Japanese Patent Laid-Open No. 2002-6804 JP 2004-140800 A

  However, in the configuration of the above-described conventional patent document 1, there is a problem that the luminance matches but the color does not match. When displaying other than white, the color difference between the image display devices is detected, and the joint is known. There was a problem that.

  Patent Document 2 discloses correction of chromaticity, but does not describe a method of matching the chromaticity and luminance of a plurality of image display devices in a multi-screen display device.

  The present invention solves the above-described conventional problems, and when a multi-screen display device is configured by combining a plurality of image display devices, a multi-screen display device and a display image that are inconspicuous between the image display devices. It aims at providing the adjustment method of.

  In order to solve the above-described problems, a multi-screen display device of the present invention is a multi-screen display device including a plurality of image display devices and a control device that communicates with the plurality of image display devices. A plurality of light sources having different emission colors; measuring means for measuring the intensity or intensity and chromaticity of the plurality of light sources; and receiving means for receiving a target value of luminance or chromaticity of the image display device from the control device; A storage means for storing the target value received by the receiving means or a value calculated from the target value, and an adjustment means for adjusting the intensity or intensity and chromaticity of the light source based on the contents of the storage means and the measurement results of the measurement means It is characterized by having. As a result, when a multi-screen display device is configured by combining a plurality of image display devices, it is possible to provide a multi-screen display device that is inconspicuous between the image display devices.

  In the multi-screen display device of the present invention, if the image display device further includes a transmission unit and the target value cannot be realized, a signal to that effect or a newly set target value may be transmitted to the control device. . Thereby, the control apparatus can always monitor the information on the luminance and chromaticity of each image display apparatus constituting the multi-screen display apparatus.

  In the multi-screen display device of the present invention, the control device that has received the signal indicating that the target value cannot be realized or the new target value has received a plurality of new target values or new target values set by the control device itself. You may make it transmit to an image display apparatus. As a result, the control device can align the target values of the luminance and chromaticity of all the image display devices constituting the multi-screen display device.

  In the multi-screen display device of the present invention, when setting a new target value, only the luminance target value may be lowered. Thereby, the chromaticity of all the image display apparatuses which comprise a multiscreen display apparatus is maintainable.

  In the multi-screen display device of the present invention, the chromaticity adjustment means may realize the chromaticity adjustment by simultaneously emitting a plurality of light sources having different emission colors. As a result, it is possible to adjust the chromaticity of a light source that cannot be adjusted by a single light source of each color.

  In the multi-screen display device of the present invention, the control device may be incorporated in at least one of the plurality of image display devices. This eliminates the need for a special control device and allows the multi-screen display device to be configured easily and inexpensively.

  A method for adjusting a display image of a multi-screen display device according to the present invention adjusts brightness and chromaticity of a multi-screen display device including a plurality of image display devices and a control device that communicates with the plurality of image display devices. Measuring the intensity or intensity and chromaticity of a plurality of light sources having different emission colors of the image display device, receiving a target value of luminance or chromaticity of the image display device from the control device, and receiving The target value or a value calculated from the target value is stored in the storage means, and the intensity or intensity and chromaticity of the light source is adjusted based on the contents of the storage means and the measurement result. As a result, when a multi-screen display device is configured by combining a plurality of image display devices, it is possible to provide a method for adjusting the display image of the multi-screen display device that is inconspicuous between the image display devices.

  Further, according to the method of adjusting the display image of the multi-screen display device of the present invention, when the image display device cannot achieve the target value, a signal to that effect or a newly set target value is transmitted to the control device to realize the target value. The control device that has received the signal indicating that it cannot be performed or a new target value may transmit the received new target value or a new target value set by the control device itself to a plurality of image display devices. As a result, the control device can always monitor the luminance and chromaticity information of each image display device that constitutes the multi-screen display device, and aligns the target values of all the image display devices that constitute the multi-screen display device. be able to.

  In the method for adjusting the display image of the multi-screen display device of the present invention, when setting a new target value, only the luminance target value may be lowered. Thereby, the chromaticity of all the image display apparatuses which comprise a multiscreen display apparatus is maintainable.

  As described above, according to the present invention, when a multi-screen display device is configured by combining a plurality of image display devices, a multi-screen display device and a display image adjustment method that are inconspicuous between the image display devices are provided. Can be provided.

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

(Embodiment 1)
FIG. 1 is a schematic configuration diagram of a multi-screen display device according to Embodiment 1 of the present invention. In the present embodiment, a projector is described as an example of the image display device. The multi-screen display device according to the present embodiment includes four projectors 101a, 101b, 101c, and 101d, a control device 102 for controlling the luminance and chromaticity of the four projectors, and a screen 103 that displays a projected image. Has been. The control device 102 is connected to four projectors 101a to 101d via a communication line such as RS232C. The control device 102 may be a normal personal computer or a special control device for a multi-screen display device. In the present embodiment, there are four projectors 101a to 101d, but it is needless to say that the number is not limited to four.

  FIG. 2 is a block diagram showing an internal configuration of projector 101a according to the present embodiment. The other projectors 101b, 101c, and 101d have the same configuration. The projector 101a includes a red light source 201a such as an LED that emits red, blue, and green light, a blue light source 201b, and a green light source 201c, and a red sensor 202a that measures the intensity and chromaticity of the light from each light source. Blue sensor 202b, green sensor 202c, A / D converters 203a, 203b, 203c that convert measured values from the sensors of the respective colors into digital values, and a memory that stores target values of the intensity and chromaticity of each light source 207, a control unit (microcomputer) 206 that controls each light source based on the measurement value and the target value, D / A converters 205a, 205b, and 205c that convert a control signal from the control unit 206 into an analog signal, and a light source A red light source driving circuit 204a, a blue light source driving circuit 204b, a green light source driving circuit 204c, and Each color light is composed of a light combining unit 209 that combines three light beams, an image input IF 210, a signal processing unit 211 that performs image enlargement / reduction, and a DMD (Digital Micro Mirror Device) (registered trademark). Is composed of a display element 212 that modulates the image signal with an image signal, a projection unit 213 that projects an image onto a screen (not shown), and an RS232CIF 208 for communicating with the external control device 102.

  Next, the operation of the projector will be described with reference to FIG. FIG. 3 is a diagram illustrating the relationship between the emission intensity of the red light source 201a, the blue light source 201b, and the green light source 201c and the image signal input to the display element 212.

  When an image signal is input to the signal processing unit 211 via the image input IF 210, the signal processing unit 211 performs signal processing such as enlargement or reduction, and sends the processed signal to the display element 212. For example, in the case of a multi-screen display device that displays one image on four projectors, the input image is enlarged four times. The display element 212 modulates the light combined by the light combining unit 209 based on the image signal supplied from the signal processing unit 211, and projects it onto the screen by the projection unit 213. Modulation of light of three colors, red, blue, and green is sequentially performed in a time division manner. That is, as shown in FIG. 3, red light is supplied from the light combining unit 209 when an image signal corresponding to red is input to the display element 212. The same applies to blue and green.

  Then, the display element 212 sequentially modulates image signals corresponding to the respective colors of red, blue, and green and light of the corresponding colors. If the time division speed is sufficiently increased, a color moving image will be recognized by the human because of the afterimage phenomenon of the human retina. By the way, as shown in FIG. 3, even when a red image signal is input, not only a red light source but also a blue or green light source is caused to emit light. This is to adjust the chromaticity of the projector by equivalently changing the chromaticity of the light source by causing other light sources to emit light simultaneously when the chromaticity is different among the plurality of projectors.

  When a red image signal is input to the display element 212, the intensity of the red light source 201a is Yrr, the intensity of the blue light source 201b is Ybr, and the intensity of the green light source 201c is Ygr. Similarly, when a blue image signal is input to the display element 212, the intensity of the red light source 201a is Yrb, the intensity of the blue light source 201b is Ybb, and the intensity of the green light source 201c is Ygb. Similarly, when a green image signal is input to the display element 212, the intensity of the red light source 201a is Yrg, the intensity of the blue light source 201b is Ybg, and the intensity of the green light source 201c is Ygg. The brightness and chromaticity of the projector 101a can be freely adjusted under certain conditions by controlling the intensity values of the nine light sources.

  Next, a specific method for adjusting the luminance and chromaticity of the projector will be described. In order to simplify the description, adjustment between two projectors 101a and 101b will be described as an example. Normally, the intensity and chromaticity of a light source used in a projector changes with time due to changes in the usage environment such as temperature and humidity, LED deterioration, etc., and accordingly the brightness and chromaticity of the projector also change. First, it is assumed that the temporal change of the light source occurs only in the intensity, and the chromaticity does not change. In this case, therefore, the chromaticity need only be measured at the time of installation, and only the intensity of the light source needs to be monitored.

  FIG. 4 shows the chromaticity and chromaticity target values of the two projectors 101a and 101b at the time of installation on the xy chromaticity diagram. For example, the chromaticities of the red, blue, and green light sources (LEDs) of the projector 101a are represented by positions R1, B1, and G1, and the chromaticities of the light sources of the projector 101b are represented by positions R2, B2, and G2. It is assumed that there is chromaticity variation between the two projectors. If the projector 101a and the projector 101b are arranged without adjusting the chromaticity, the color looks different even if the same image is displayed, so that the joint between the two projectors can be recognized.

  By the way, the projector 101a can display the chromaticity inside the triangle having R1, B1, and G1 as vertices by changing the mixing ratio of the light of the three color light sources. Similarly, the projector 101b can display R2, B2, and G2. It is possible to display the chromaticity inside the triangle whose vertex is. Therefore, for example, any projector can be used as long as it is inside a triangle having the three points as vertices using the chromaticities of R, G, and B in FIG. 4 as the three primary colors.

  FIG. 5 is a flowchart illustrating how the control device 102 matches the luminance and chromaticity between the two projectors 101a and 101b. A method of adjusting the luminance and chromaticity of the multi-screen display device will be described with reference to FIG. First, in steps S502a and S502b, the projectors 101a and 101b store the initial value of the target intensity in the area of the memory 207 corresponding to the red sensor 202a, the blue sensor 202b, and the green sensor 202c. The initial values are set so that the projectors 101a and 101b have the same brightness and chromaticity.

  Next, in steps S503a and S503b, the projector operates to maintain the chromaticity of the projector even if the intensity of each light source changes. In steps S504a and S504b, it is determined whether the luminance can be maintained while maintaining the same chromaticity. If the luminance cannot be maintained (in the case of Yes), an operation of decreasing the luminance is performed in steps S505a and S505b.

  The control device 102 periodically monitors whether or not the brightness of each of the projectors 101a and 101b has decreased in step S501. Issues a command to lower the other brightness so that the brightness is lower, and the projector that has received this command lowers the brightness in accordance with the command. The interval for monitoring the luminance may be determined according to the change in luminance of the projector. For example, if it is expected to change in a short time depending on the usage environment such as temperature, the interval may be 1 minute. If only the change in luminance due to the deterioration of the LED element itself or the like is to be considered, it may be 1 month. It may be once.

  FIG. 6 is a flowchart for explaining in more detail the above-described adjustment method between projectors. Based on this flowchart, a method of adjusting the light source inside the projector will be described in detail.

  When the power of the projector is turned on or an adjustment button or the like is pressed, first, target values of nine intensity values Yrr to Ygg of each light source are fetched from the memory 207 in step S601. Next, in step S602, the measured values of the nine intensity values Yrr to Ygg of each light source are taken from the sensors of the respective colors. In step S603, it is determined whether or not these measured values and target values all match. If all the nine intensity values match the target value (in the case of Yes), the process waits for a predetermined time set by the timer in step S604. When the predetermined time has elapsed, it is determined in step S605 whether or not a new luminance target value has been received from the control device 102. If it has not been received (in the case of No), the process returns to step S602 and enters the monitoring loop again. On the other hand, if a new luminance target value has been received (in the case of Yes), the process proceeds to step S608, and a new target value of nine intensity values of each light source is calculated so as to become a new luminance target value. In step S609, the contents of the memory storing the target value are updated to the new target value, and the process returns to the first step S601.

  On the other hand, if at least one of the nine intensity values does not match the target value in step S603 (in the case of No), the adjustment loop is entered. In step S606, the drive current of the light source that does not match the target value is increased or decreased according to the measurement result. That is, if the measured value is smaller than the target value, the drive current is increased to increase the light emission intensity. Conversely, if the measured value is larger than the target value, the drive current is decreased to decrease the light emission intensity. In step S607, it is determined whether or not the drive current has reached the maximum (drive capacity limit) as a result of increasing or decreasing the drive current in step S606. If it is determined that the drive current is not the maximum and the current can be further flowed, the process returns to step S602, and this adjustment loop is repeated until the intensities of all the light sources coincide with the target values. In a normal state, the light sources (red light source 201a, blue light source 201b, and green light source 201c) have target intensity values. Even if the maximum current is supplied, sufficient strength cannot be obtained.

  If it is determined in step S607 that the drive current is maximum, it is determined that no further adjustment is possible, and the process proceeds to step S608. In step S608, the target value of the nine intensity values of each light source is decreased by a certain ratio (for example, K) to calculate a new target value, and the target value in the memory is updated in step S609. Thus, by reducing the target value of the nine intensity values at a certain rate, the chromaticity can be maintained even though the brightness of the projector is lowered. Then, the process returns to step S601, and adjustment starts from the same state as when the power is turned on. At the same time, in step S610, a new target value of the brightness of the projector is calculated from the new target value of the light source, and when there is an inquiry from the control device 102, this target value of brightness is transmitted to the external control device 102.

  In the above description, the target value of the intensity of each light source is stored in the memory. However, the present invention is not limited to this, and the target value of the brightness and chromaticity of each projector may be stored. Thus, the target value of the intensity of each corresponding light source is calculated from the target values of luminance and chromaticity. Further, although the content communicated with the external control device is the target value of the brightness of the projector, the target value itself of the nine intensity values of each light source may be communicated. Further, the target value of luminance may be determined by an external control device, and the target value may be transmitted to each projector. At this time, only information indicating that the target value of luminance cannot be achieved is sent from each projector, and the control device determines a new target value of luminance.

  In addition, the determination of whether the target value and the measurement value match may have a width. By doing so, it is possible to prevent a burden on the control device 102 and the like from increasing due to the brightness being adjusted many times due to a slight change in intensity.

  So far, the case where only the intensity of the light source changes with time has been described, but the same adjustment can be made even when the chromaticity of the light source also changes with time. In this case, the coordinates of the chromaticity of each light source of the projector shown in FIG. 4 change on the xy chromaticity diagram. In this case, the color sensor may measure not only the intensity of each light source but also the chromaticity in step S602, and determine target values Yrr to Ygg of nine intensities of each light source from the measurement results of the intensity and chromaticity.

  As described above, according to the multi-screen display device of the present invention, even if the brightness and chromaticity of the projectors constituting the multi-screen display device change over time due to various causes, the brightness and color of all projectors. The degree can be adjusted accurately and quickly, and the joints between the projectors can be made inconspicuous.

  It goes without saying that the content of the present invention is not limited to the specific examples shown in the above-described embodiments, and for example, the following modifications can be considered.

(1)
In the above embodiment, the method of reducing the brightness of each projector after the brightness of each projector is reduced has been described, but the present invention is not limited to this. For example, when the luminance of the projector does not reach the target value, information indicating that the luminance does not reach the target value is immediately transmitted to the control device 102 without changing the target value of the luminance of the projector 101a. When a command to lower the brightness is transmitted to the projector, the content of the memory 207 may be updated based on the signal. In this way, the brightness of all projectors can be changed at the same time.

(2)
In the above embodiment, the chromaticity of all the projectors is adjusted by reducing the luminance while keeping the intensity ratio of the red, blue, and green light sources constant. However, the present invention is not limited to the above method. For example, when the maximum intensity does not reach the target value for one of a plurality of light sources with different emission colors, the reduction in luminance is reduced by changing the ratio of the intensity of the red, blue, and green light sources within an allowable range. There is a method of instructing other image display devices to change to the same chromaticity (without changing the luminance).

  Specifically, for example, information that the chromaticity has changed may be monitored by the control device 102 to perform an operation of changing the chromaticity of the other projector. In that case, FIG. 5 changes as follows. That is, it may be determined whether or not chromaticity can be maintained in steps S504a and S504b, and an operation of changing luminance or chromaticity may be performed in steps S505a and S505b.

  In addition, “inquiry about luminance” from the control device 102 becomes “inquiry about luminance and chromaticity”, and “decrease in luminance” in step S501 becomes “has the luminance or chromaticity changed?” The “command for lowering” is “command for changing luminance or chromaticity”. By doing so, there is an advantage that the luminance and chromaticity of all the projectors can be matched, and a decrease in the overall luminance can be reduced as compared with the case where the chromaticity is made constant.

(3)
If the chromaticity of the light source changes greatly (for example, if the chromaticity of G1 enters the inside of the RGB triangle in FIG. 4), the chromaticity of G is expressed only by changing the intensity ratio of the three light sources. I can't. Also in this case, it is possible to match the chromaticities of the image display apparatuses by changing the RGB chromaticity target values of all the projectors.

  When the target value of the chromaticity of the light source is not changed, in order to make the target value a feasible value, it is necessary to provide a margin for adjustment by reducing the size of the RGB triangle in FIG. However, by making the target value variable, the light source capability of the projector can be used more effectively (the width inside the RGB triangle, that is, the range of colors to be expressed is expanded).

(4)
In the above embodiment, an example in which three light sources having different emission colors are used has been described. However, it is not necessary to have a plurality of devices that generate light, and the intensity of light of a plurality of different colors can be changed independently. It only has to be made. For example, after passing a white lamp and a device that separates white light into red, blue, and green light and a filter that can control the light transmittance of red, blue, and green light with voltage, the light is combined. It may be.

(5)
In the above embodiment, the case where the chromaticity is corrected by changing the intensity of the light source has been described. However, the chromaticity of the light source itself may be changed by changing the current or voltage supplied to the light source. In this case, the chromaticity of the image display device can be corrected by directly changing the chromaticity of the light source. A portion that cannot be adjusted by changing the chromaticity of the light source may be adjusted by the intensity of the light source.

(6)
In the above embodiment, the case where the control device 102 makes an inquiry about the luminance (or luminance and chromaticity) to the projector in order to match the maximum luminance of each image display device has been described with reference to FIG. However, it is not limited to this. For example, when the brightness setting is changed or when it is necessary to change the brightness, each projector may transmit the changed brightness without any inquiry from the control device.

(7)
Although it has been described that the intensity is adjusted by changing the drive current to adjust the light source, the intensity may be kept constant and the light emission time may be changed. By doing so, even when the chromaticity of the light source is changed by the supplied current, only the intensity can be changed without changing the chromaticity of the light source. In this case, the measured value and the target value of each color sensor are not the intensity of the light source but the light intensity obtained by integrating the intensity over time.

(8)
In the above embodiment, the case where the intensity of each light source is individually measured has been described, but light may be measured after photosynthesis. By doing so, it is possible to measure the light intensity and chromaticity of each color that is closer to the actual color, including the transmittance of the light combining unit.

(9)
In the above-described embodiment, the adjustment loop is rotated every predetermined time. However, the intensity of each light source may be measured only when the power is turned on or when there is a trigger from the user. In this case, light corresponding to the above nine intensities may be sequentially emitted for measurement. In this way, accurate intensity or chromaticity can be measured without worrying about the response time of the light source.

(10)
Here, an example using RS232C as a standard for connecting a projector and a control device has been described. However, a USB (Universal Serial Interface), a wired LAN (Local Area Network), or a wireless LAN may be used, but the invention is not limited thereto.

(11)
In the above embodiment, the configuration having the control device outside has been described, but the function of the control device may be provided in the projector. By doing so, a multi-screen display system can be easily configured.

(12)
Although the projector has been described as an example of the image display device in the above embodiment, the present invention is not limited to this, and can be widely applied to a backlight type liquid crystal display device and the like.

  The present invention can realize a multi-screen display device that displays a seam without conspicuous when displaying on a large screen using a plurality of image display devices.

1 is a schematic configuration diagram of a multi-screen display device according to a first embodiment of the present invention. 1 is a block diagram of a multi-screen display device according to a first embodiment of the present invention. The figure explaining the relationship between the light emission intensity | strength of each light source, and an image signal in the multi-screen display apparatus of Embodiment 1 of this invention. In the multi-screen display device according to Embodiment 1 of the present invention, the chromaticity when two projectors are installed and the target chromaticity are represented on an xy chromaticity diagram. The flowchart which shows operation | movement of the multi-screen display apparatus of Embodiment 1 of this invention. The flowchart which shows the operation | movement of a projector in detail in the multi-screen display apparatus of Embodiment 1 of this invention.

Explanation of symbols

101a, 101b, 101c, 101d Projector 102 Control device 103 Screen 201a Red light source 201b Blue light source 201c Green light source 202a Red sensor (measuring means)
202b Blue sensor (measuring means)
202c Green sensor (measuring means)
203a, 203b, 203c A / D converter 204a Red light source drive circuit (adjustment means)
204b Blue light source drive circuit (adjustment means)
204c Green light source drive circuit (adjustment means)
205a, 205b, 205c D / A converter 206 Control unit 207 Memory (storage means)
208 RS232CIF (transmission means / reception means)
209 Photosynthesis unit 210 Image input IF
211 Signal processing unit 212 Display element 213 Projection unit

Claims (9)

A multi-screen display device comprising a plurality of image display devices and a control device communicating with the plurality of image display devices,
The image display device
A plurality of light sources having different emission colors;
Measuring means for measuring the intensity or intensity and chromaticity of the plurality of light sources;
Receiving means for receiving a target value of luminance or chromaticity of the image display device from the control device;
Storage means for storing the target value received by the receiving means or a value calculated from the target value;
A multi-screen display device comprising adjustment means for adjusting the intensity or intensity and chromaticity of the light source based on the content of the storage means and the measurement result of the measurement means. The image display device further includes a transmission means,
2. The multi-screen display device according to claim 1, wherein if the target value cannot be realized, a signal to that effect or a newly set target value is transmitted to the control device. The control device that has received a signal indicating that the target value cannot be realized or a new target value transmits the received new target value or a new target value set by the control device itself to the plurality of image display devices. The multi-screen display device according to claim 2. 4. The multi-screen display device according to claim 2, wherein when a new target value is set, only the luminance target value is lowered. 2. The multi-screen display device according to claim 1, wherein the chromaticity adjusting means realizes the chromaticity adjustment by simultaneously emitting a plurality of light sources having different emission colors. The multi-screen display device according to claim 1, wherein the control device is built in at least one of the plurality of image display devices. A method for adjusting the brightness and chromaticity of a multi-screen display device comprising a plurality of image display devices and a control device communicating with the plurality of image display devices,
Measure the intensity or intensity and chromaticity of a plurality of light sources having different emission colors of the image display device,
Receiving a target value of luminance or chromaticity of the image display device from the control device;
Storing the received target value or a value calculated from the target value in a storage means;
A method of adjusting a display image of a multi-screen display device, wherein the intensity or intensity and chromaticity of the light source is adjusted based on the contents of the storage means and the measurement result. If the image display device cannot achieve the target value, send a signal to that effect or a newly set target value to the control device,
The control device that has received a signal indicating that the target value cannot be realized or a new target value transmits the received new target value or a new target value set by the control device itself to the plurality of image display devices. The method for adjusting a display image of a multi-screen display device according to claim 7. 9. The method of adjusting a display image of a multi-screen display device according to claim 8, wherein when setting a new target value, only the target value of the brightness is lowered.

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