JP2010197631A - Display device and display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance accuracy in luminance correction of a display element based on a stain-caused decline value and a current-caused decline value. <P>SOLUTION: In the display device, a stain-caused decline value determination section 1c determines the stain-caused decline value that express a degree of luminance decline caused by stain in each display unit based on stain-caused decline information stored in a stain-caused decline information storage section 1a and an installation period of each display unit integrated by an installation period measurement section 1b. A current-caused decline value determination section 1f determines the current-caused decline value that express a degree of luminance decline caused by integrated current in each display unit based on current-caused decline information stored in a current-caused decline information storage section 1d and the integrated current in each display unit integrated by an integrated current measurement section 1e. A luminance adjustment section 1g corrects the luminance difference between each display unit based on the stain-caused decline value determined by the stain-caused decline value determination section 1c and the current-caused decline value determined by the current-caused decline value determination section 1f for the each display unit. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device and a display method, and more particularly to a display device and a display method that include a plurality of display units in which one or more display elements are arranged and display an image by causing the display elements to emit light.

  Conventionally, display devices for displaying news videos and event videos on a large display board are installed outdoors, in halls, and stadiums. A display panel provided in such a display device is provided with a plurality of display elements. The display device displays an image on the display panel by causing a plurality of display elements to emit light. For example, a light emitting diode (LED) is used as the display element.

Here, when an image is displayed by a plurality of display elements, it is difficult to view the image if the luminance of each display element varies. For this reason, it is necessary to make the luminance of each display element uniform.
For example, when an LED is used as the display element, even if each LED is driven with the same current, the brightness of each element varies. In order to correct this, each LED is driven by an individual driver, and the drive current is corrected so that the luminance of each LED is uniform.

  Further, the LED is subject to deterioration of luminance with time (aging) according to the usage time. For this reason, it is possible to adjust the brightness | luminance of each LED so that predetermined | prescribed brightness | luminance may be compensated about each LED. As such a method, for example, a method of measuring the light emission amount of the light emitting element, comparing the measured level with the device specific level, and adjusting the light emission amount of the light emitting element to a device specific level is known. (For example, refer to Patent Document 1). Also, a method is known in which the time width of the LED output permission pulse is expanded in accordance with the operating time to compensate for the aging deterioration of luminance (see, for example, Patent Document 2).

  Furthermore, the deterioration of the luminance of the LED over time becomes a problem even when part of the LED on the display panel is replaced. At the time of replacement, a new LED is installed in the existing LED. That is, a difference in luminance occurs between an existing LED whose luminance has been reduced due to aging and a new LED which has not deteriorated. For this reason, it is necessary to adjust such a difference in luminance. On the other hand, information (luminance conversion parameters, etc.) for correcting the difference in luminance of each LED is given to each LED (or each unit if the replacement target is a unit in which a plurality of LEDs are arranged). There is known a method of adjusting the brightness of each unit (if the replacement target is a unit) (see, for example, Patent Documents 3 and 4).

JP 09-216414 A JP 2000-351543 A Japanese Patent Laid-Open No. 11-344949 JP 2006-267314 A

  By the way, a plurality of causes of luminance deterioration of the LED can be considered. For example, it is conceivable that the terminal electrode of the LED deteriorates due to the current, or the translucency of the resin that seals the LED chip decreases due to the emission heat of the LED. Such deterioration is caused by the current passed through the LED. Further, for example, deterioration due to dirt such as dust accumulated on the LED can be considered. Deterioration due to dirt becomes particularly remarkable when the display device is installed outdoors.

For this reason, it has been desired to accurately correct the luminance of the LED in consideration of these causes.
The present invention has been made in view of these points, and an object thereof is to provide a display device and a display method capable of improving the accuracy of luminance correction of a display element.

  In order to solve the above-described problems, a display device is provided that includes a plurality of display units each including one or more display elements and displays an image by causing the display elements to emit light. This display device includes a stain deterioration value determination unit, a current deterioration value determination unit, and a luminance adjustment unit. The stain deterioration value determining unit stores the stain deterioration information stored in the stain deterioration information storage unit that stores stain deterioration information in which the installation time of the display unit and the stain deterioration value indicating the degree of luminance deterioration due to the stain of the display unit are associated with each other. Based on the information and the installation time of each display unit accumulated by the installation time measuring unit, the contamination deterioration value of each display unit is determined. The current deterioration value determination unit is stored in a current deterioration information storage unit that stores current deterioration information in which the integrated current flowing through the display unit and the current deterioration value indicating the degree of luminance deterioration due to the integrated current of the display unit are associated with each other. The current deterioration value of each display unit is determined based on the current deterioration information and the integrated current of each display unit integrated by the integrated current measuring unit. The brightness adjustment unit corrects the difference in brightness between the display units based on the stain deterioration value determined by the stain deterioration value determination unit and the current deterioration value determined by the current deterioration value determination unit for each display unit.

  According to such a display device, the stain deterioration value determination unit stores the stain deterioration information in which the stain deterioration information storing the display unit installation time and the stain deterioration value indicating the degree of deterioration of the luminance due to the stain of the display unit is stored. Based on the stain deterioration information stored in the information storage unit and the installation time of each display unit accumulated by the installation time measurement unit, the stain deterioration value of each display unit is determined. The current deterioration value determining unit stores the current deterioration information in the current deterioration information storage unit that stores current deterioration information in which the integrated current flowing through the display unit and the current deterioration value indicating the degree of luminance deterioration due to the integrated current of the display unit are associated with each other. The current deterioration value of each display unit is determined based on the current deterioration information and the integrated current of each display unit integrated by the integrated current measuring unit. The brightness adjustment unit corrects the difference in luminance between the display units based on the stain deterioration value determined by the stain deterioration value determination unit for each display unit and the current deterioration value determined by the current deterioration value determination unit.

  Moreover, in order to solve the said subject, the display method which performs the process similar to the said display apparatus is provided.

  According to the display device and the display method described above, the luminance correction accuracy can be improved by performing the luminance correction of the display element in consideration of the luminance deterioration due to dirt and the luminance deterioration due to the integrated current.

It is a figure which shows a display apparatus. It is a figure which shows a display system. It is a figure which shows the hardware constitutions of a control apparatus. It is a figure which shows the unit structure of a display apparatus. It is a figure which shows the function structure of a control apparatus. It is a figure which shows the example of a data structure of a stain | pollution | contamination brightness degradation table. It is a figure which shows the measurement data example of the luminance degradation by dirt. It is a figure which shows the example of a data structure of a current luminance degradation table. It is a figure which shows the measurement data example of the brightness | luminance degradation by an integrated current. It is a figure which shows the example of a data structure of an integrating | accumulating data table. It is a figure which shows the example of a data structure of a brightness | luminance correction coefficient table. It is a flowchart which shows the procedure of an integration data acquisition process. It is a flowchart which shows the procedure of the correction process at the time of unit exchange. It is a flowchart which shows the procedure of a periodic correction process. It is a flowchart which shows the procedure of the correction process at the time of cleaning.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
FIG. 1 is a diagram illustrating a display device. The display device 1 includes a stain degradation information storage unit 1a, an installation time measurement unit 1b, a stain degradation value determination unit 1c, a current degradation information storage unit 1d, an integrated current measurement unit 1e, a current degradation value determination unit 1f, a luminance adjustment unit 1g, A display panel 10 is provided.

  Here, the display board 10 includes display units 11, 12,..., 19 for displaying images. The display units 11, 12,..., 19 are arranged in 3 × 3. The display units 11, 12,..., 19 are provided with one or more display elements. The display element is, for example, an LED. In this case, for example, one set of three colors of red, green, and blue LEDs is formed to form one display element. The display device 1 displays an image on the display panel 10 by causing the display elements arranged in the display units 11, 12,. Note that the number of display units is not limited to a 3 × 3 array, but may be an arbitrary array of m × n (n and m are natural numbers).

The stain deterioration information storage unit 1a stores stain deterioration information in which the installation time of the display unit is associated with the stain deterioration value indicating the degree of luminance deterioration due to the stain of the display element.
The installation time measuring unit 1b integrates the installation time of each display unit. The installation time of each display unit is the time elapsed from when each display unit is attached to the display panel 10 until the current time point. For example, when the display unit 15 is replaced with a new one, the installation time measuring unit 1b resets the installation time for the display unit 15 and starts again from zero.

  The stain deterioration value determination unit 1c determines the stain deterioration value of each display unit based on the stain deterioration information stored in the stain deterioration information storage unit 1a and the installation time of each display unit measured by the installation time measurement unit 1b. decide.

The current deterioration information storage unit 1d stores current deterioration information in which an integrated current flowing through the display unit is associated with a current deterioration value indicating a degree of luminance deterioration due to the integrated current of the display unit.
The integrated current measuring unit 1e integrates the integrated current flowing through each display unit.

  The current deterioration value determining unit 1f determines the current deterioration value of each display unit based on the current deterioration information stored in the current deterioration information storage unit 1d and the integrated current of each display unit measured by the integrated current measuring unit 1e. To do.

  The luminance adjustment unit 1g corrects the difference in luminance between the display units based on the contamination deterioration value determined by the contamination deterioration value determination unit 1c and the current deterioration value determined by the current deterioration value determination unit 1f for each display unit. To do.

  According to the display device 1, the stain deterioration value of each display unit is determined based on the stain deterioration information stored in the stain deterioration information storage unit 1a and the installation time of each display unit accumulated by the installation time measurement unit 1b. It is determined. Further, the current deterioration value of each display unit is determined based on the current deterioration information stored in the current deterioration information storage unit 1d and the integrated current of each display unit integrated by the integrated current measuring unit 1e. Then, based on the dirt deterioration value and the current deterioration value determined for each display unit, the luminance difference between the display units is corrected.

  Thereby, the accuracy of luminance correction can be improved. That is, since the influence of each factor (dirt and accumulated current) that greatly contributes to the deterioration of the luminance of each display unit is individually evaluated, the luminance difference between the display units can be obtained with high accuracy. Then, by adjusting the brightness of each display unit based on the acquired brightness difference, the brightness difference between the display units can be made uniform with high accuracy, and a more easily viewable image can be displayed.

Hereinafter, the display apparatus 1 will be described more specifically by taking an example of an apparatus installed outdoors and displaying an event video or the like.
FIG. 2 is a diagram illustrating a display system. This display system includes a control device 100, a display panel 200, a management terminal device 300, and a video transmission device 400. The control device 100 is connected to the display panel 200 by a predetermined data transmission / reception cable 31 and a video signal transmission / reception cable 32. The data transmission / reception cable 31 is, for example, a TP (Twisted Pair) cable or a serial communication cable. The video signal transmission / reception cable 32 is a coaxial cable that supports transmission / reception of SD-SDI (Standard Definition-Serial Digital Interface) signals and HD-SDI (High Definition-SDI) signals, for example. In addition, the control device 100, the management terminal device 300, and the video transmission device 400 are connected via the network 20 and can perform data communication with each other.

  The control device 100 acquires image data to be displayed on the display panel 200 from the video transmission device 400. The control device 100 outputs the acquired image data to the display panel 200 via the video signal transmission / reception cable 32. Further, the control device 100 transmits / receives various data to / from the display panel 200 via the data transmission / reception cable 31.

  Further, the control device 100 controls the operation of the display panel 200 in accordance with a command received from the management terminal device 300. Thereby, the control apparatus 100 can perform starting / stopping of the display panel 200, for example.

  The display board 200 displays the image data acquired from the control device 100 on the screen. The screen of the display panel 200 is provided with a plurality of display units. In each display unit, a plurality of LEDs are arranged as display elements. The display board 200 displays an image by causing each LED to emit light.

  The management terminal device 300 is for operation management of the display panel 200 by an operator. The operator can browse and operate a predetermined interface of the management terminal device 300 and transmit a command for operation management to the control device 100.

  The video transmission device 400 generates image data to be displayed on the display panel 200 and transmits it to the control device 100. The video transmission device 400 is a digital camera, for example. The video transmission device 400 may be a video distribution computer that stores image data.

  FIG. 3 is a diagram illustrating a hardware configuration of the control device. The control device 100 includes a CPU (Central Processing Unit) 101, a RAM (Random Access Memory) 102, an HDD (Hard Disk Drive) 103, a display panel image processing device 104, a monitor image processing device 105, an input interface 106, and a communication interface. 107 and 108 and a video signal transmission device 109.

The CPU 101 controls the overall operation of the control device 100.
The RAM 102 temporarily stores at least part of an OS program and application programs to be executed by the CPU 201. The RAM 102 stores various data necessary for processing by the CPU 101.

The HDD 103 stores OS programs and application programs. The HDD 103 stores various data necessary for processing by the CPU 101.
The display panel image processing apparatus 104 converts the image data to be displayed on the display panel 200 into a signal (for example, an SDI signal) to be transmitted to the display panel 200 via the video signal transmission / reception cable 32.

The monitor image processing apparatus 105 is connected to the monitor 21. The monitor image processing apparatus 105 displays an image on the screen of the monitor 21 in accordance with a command from the CPU 101.
The input interface 106 is connected to the keyboard 22 and the mouse 23. The input interface 106 outputs signals sent from the keyboard 22 and the mouse 23 to the CPU 101.

  The communication interfaces 107 and 108 are interfaces for communicating with other information processing apparatuses. The communication interface 107 is connected to the management terminal device 300 and the video transmission device 400 via the network 20. The communication interface 108 is connected to the display panel 200 via the data transmission / reception cable 31.

The video signal transmission device 109 transmits the signal generated by the display panel image processing device 104 to the display panel 200 via the video signal transmission / reception cable 32.
The management terminal device 300 and the video transmission device 400 can also be realized by the same hardware configuration as the control device 100.

  FIG. 4 is a diagram showing a unit configuration of the display panel. The display panel 200 has a screen divided into modules. The display panel 200 includes modules 210, 210a,. Modules 210, 210a,..., 210e are arranged in a 2 × 3 vertical and horizontal direction.

  A module ID “M-1” is defined for the module 210. Module ID “M-2” is defined in module 210a. Module ID “M-3” is defined in the module 210b. Module ID “M-4” is defined in module 210c. Module ID “M-5” is defined in module 210d. A module ID “M-6” is defined in the module 210e.

  The modules 210, 210a,..., 210e are formed in a plate shape, and a plurality of units are arranged on the surface thereof. The unit configuration of the module 210 will be described below, but the same applies to the modules 210a, 210b,.

The module 210 includes display units 211, 212,.
The display units 211, 212,..., 226 are arranged on the surface of the module 210 in 4 × 4 length and width directions. Each of the display units 211, 212,..., 226 is an array of a plurality of LEDs.

  The display units 211, 212,..., 226 are associated with information indicating positions in the module 210. For example, with the upper left side of the module 210 as the origin, the x axis is taken in the horizontal direction and the y axis is taken in the vertical direction. Then, x coordinates indicating positions are defined as 1 to 4 closer to the origin on the right side of the origin. Further, y coordinates indicating positions are defined as 1 to 4 from the side closer to the origin below the origin. In this way, the positions of the display units 211, 212, ..., 226 in the module 210 can be defined. Specifically, the position of the display unit 211 is (x, y) = (1, 1). The position of the display unit 212 is (x, y) = (2, 1). Hereinafter, the position to the display unit 226 is similarly defined.

  The arrangement of the modules is not limited to 2 × 3 in the vertical and horizontal directions, and may be an arbitrary arrangement of m × n (n and m are natural numbers). Further, the arrangement of the display units is not limited to 4 × 4 in the vertical and horizontal directions, and can be an arbitrary arrangement.

  The display panel 200 displays an image by causing the LEDs of the display units provided in the modules 210, 210a,..., 210e to emit light. At this time, if the luminance of each display unit varies, it becomes difficult to see the image. Such variation in luminance becomes particularly significant when, for example, replacement is performed in units of display units. For this reason, the control device 100 and the display panel 200 can correct such variations in luminance with high accuracy. Below, the structure for this is demonstrated.

  FIG. 5 is a diagram illustrating a functional configuration of the control device. The hardware configuration of the display panel 200 related to the processing of the control device 100 is also shown. The control device 100 includes communication units 110 and 120, an image processing unit 130, a video signal transmission unit 140, a deterioration information storage unit 150, an installation time timer 160, an integrated information storage unit 170, a luminance correction information calculation unit 180, and a luminance correction information storage. Part 190. Note that these functions of the control device 100 are realized by the CPU 101 executing a predetermined program. However, some or all of these functions may be realized by dedicated hardware.

The communication unit 110 performs data communication between the control device 100, the management terminal device 300, and the video transmission device 400.
The communication unit 120 performs data communication with the display panel 200.

  When the communication unit 110 receives image data from the video transmission device 400, the image processing unit 130 acquires the image data and converts it into a video transmission signal. The image processing unit 130 outputs the converted signal to the video signal transmission unit 140.

The video signal transmission unit 140 transmits the signal acquired from the image processing unit 130 to the display panel 200.
The deterioration information storage unit 150 stores information indicating luminance deterioration according to dirt such as dust accumulated on the display unit. Here, it can be considered that the luminance deterioration according to dirt depends on, for example, how long the display unit has passed in the current installation environment. For this reason, the information indicating the luminance deterioration according to the dirt can be defined as information associated with the time when the display panel 200 is placed in the corresponding installation environment. In addition, the deterioration information storage unit 150 stores information indicating luminance deterioration according to the integrated current passed through the display unit.

  The installation time timer 160 measures the elapsed time (hereinafter referred to as installation time) from the installation of each display unit to the display panel 200 until the present time for each display unit in the display panel 200.

  The accumulated information storage unit 170 stores accumulated information including the installation time of each display unit and the accumulated current flowing through each display unit for each display unit in the display panel 200. As the installation time of each display unit, the installation time of each display unit measured by the installation time timer 160 is stored. Further, the integrated current of each display unit is measured by the display panel 200. Therefore, when the communication unit 120 receives the accumulated current data of each display unit from the display panel 200, this data is stored in the accumulated information storage unit 170 as accumulated information.

  The luminance correction information calculation unit 180 calculates luminance correction information for correcting the luminance of each display unit in units of modules. The luminance correction information is a numerical value representing an index indicating, for example, how much the luminance is reduced from the luminance serving as a reference of each display unit to eliminate variation from other display units in the same module. The luminance correction information calculation unit 180 stores the calculated luminance correction information of each display unit in the luminance correction information storage unit 190.

The brightness correction information storage unit 190 stores the brightness correction information of each display unit calculated by the brightness correction information calculation unit 180.
Note that the luminance correction information calculation processing by the luminance correction information calculation unit 180 is executed, for example, when the communication unit 110 receives a luminance correction instruction command from the management terminal device 300. At this time, the luminance correction instruction command includes information indicating the position of the display unit to be corrected, and the luminance correction information calculation unit 180 uses this command to specify the display unit to be corrected. Can do. In addition, the communication unit 120 extracts the luminance correction information of the display unit to be corrected from the luminance correction information stored in the luminance correction information storage unit 190 and transmits the extracted luminance correction information to the display panel 200.

  In addition to the modules 210, 210a,..., 210e, the display panel 200 further includes a video signal receiving unit 230, a luminance correction information receiving unit 240, a display unit light emission control unit 250, and ADCs (Analog to Digital Converters) 260, 260a. ,..., 260e and integrated current counters 270, 270a,. The modules 210, 210a,..., 210e are the same as those described with the same reference numerals in FIG.

The video signal reception unit 230 receives a video transmission signal from the video signal transmission unit 140 and outputs the received signal to the display unit light emission control unit 250.
The luminance correction information receiving unit 240 receives the luminance correction information from the communication unit 120 and outputs the luminance correction information to the display unit light emission control unit 250.

  The display unit light emission control unit 250 causes each display element of the modules 210, 210 a,..., 210 e to emit light and displays an image based on the signal acquired from the video signal receiving unit 230. The display unit light emission control unit 250 corrects the light emission luminance of each display unit of the modules 210, 210a,..., 210e based on the luminance correction information acquired from the luminance correction information receiving unit 240. As a method of correcting the luminance, for example, it is conceivable to increase or decrease the current for driving the target display unit.

  The ADCs 260, 260a,..., 260e perform analog-digital conversion on the currents that drive the modules 210, 210a,. The ADCs 260, 260a,..., 260e output the acquired current values to the integrated current counters 270, 270a,.

  The accumulated current counters 270, 270a,..., 270e average the current values acquired from the ADCs 260, 260a,. Measure. In the display panel 200, the number of display units in each module is 16. Therefore, the integrated current counters 270, 270a,..., 270e divide the current values acquired from the ADCs 260, 260a,. The accumulated current counters 270, 270a,..., 270e transmit the accumulated current measured at a predetermined timing to the communication unit 120.

  FIG. 6 is a diagram illustrating an example of the data structure of the stain luminance deterioration table. The contamination brightness deterioration table 151 is stored in advance in the deterioration information storage unit 150. The contamination brightness deterioration table 151 includes an item indicating the installation time and an item indicating the contamination deterioration constant. Information arranged in the horizontal direction of each item is associated with each other to indicate one deterioration information.

  In the item indicating the installation time, information indicating the installation time of the display unit in the corresponding operating environment is stored. In the item indicating the contamination deterioration constant, a value indicating the degree of deterioration in luminance due to contamination corresponding to the installation time is set. The contamination deterioration constant can be a value indicating the ratio of the luminance reduced from the luminance at the beginning of installation.

  In the dirt luminance deterioration table 151, for example, information that the installation time is “1 month” and the dirt deterioration constant is “0.01” is set. This is because, when the display unit is placed in the corresponding operating environment for “one month”, the luminance is set to 1 at the beginning of installation due to dirt, and the luminance is reduced by a value multiplied by 0.01, that is, the luminance is reduced by 1%. Is shown.

  The contamination brightness deterioration table 151 is created in advance by actually placing the inspection display unit in the relevant operating environment or an environment close thereto and measuring the decrease in brightness according to the installation time.

  FIG. 7 is a diagram illustrating an example of measurement data of luminance deterioration due to dirt. The graph 151a shows the degree of luminance degradation due to contamination with respect to the installation time. In the graph 151a, the horizontal axis indicates the installation time (year), and the vertical axis indicates the luminance (%) of the display unit. The luminance of the display unit is “100%” at the beginning of installation. In the example of the graph 151a, it can be seen that the luminance deterioration from the beginning of installation to about three years later is large, and thereafter the luminance gradually deteriorates. Based on the graph 151a, the stain luminance deterioration table 151 can be obtained.

  FIG. 8 is a diagram illustrating a data structure example of a current luminance deterioration table. The current luminance deterioration table 152 is stored in advance in the deterioration information storage unit 150. In the current luminance deterioration table 152, an item indicating the integrated current and an item indicating the current deterioration constant are provided. Information arranged in the horizontal direction of each item is associated with each other to indicate one deterioration information.

  Information indicating the integrated current of the display unit is stored in the item indicating the integrated current. In the item indicating the current deterioration constant, a value indicating the degree of luminance deterioration due to the corresponding integrated current is set. The current deterioration constant can be a value indicating the ratio of the luminance reduced from the luminance at the beginning of installation.

  In the current luminance deterioration table 152, for example, information that the integrated current is “0.5 kAh” and the stain deterioration constant is “0.002” is set. This is because when the integrated current of the display unit is “0.5 kAh”, the luminance is set to 1 at the beginning of installation and the luminance is reduced by a value multiplied by 0.002, that is, the luminance is reduced by 0.2%. Show.

The current luminance deterioration table 152 is created in advance by measuring the decrease in luminance according to the integrated current actually measured by passing a current through the display unit for inspection.
FIG. 9 is a diagram illustrating an example of measurement data of luminance deterioration due to the integrated current. The graph 152a shows the degree of luminance deterioration with respect to the integrated current. In the graph 152a, the horizontal axis represents the integrated current (kAh), and the vertical axis represents the luminance (%) of the display unit. Note that the luminance of the display unit is “100%” when the integrated current is “0 kAh”. In the example of the graph 152a, it can be seen that the luminance gradually deteriorates until the integrated current is about “0 to 20 kAh”, and the degree of deterioration increases when the accumulated current is higher than that. Based on the graph 152a, the current luminance deterioration table 152 can be obtained.

  FIG. 10 is a diagram illustrating a data structure example of the integration data table. The accumulated data tables 171, 172,..., 176 are stored in the accumulated information storage unit 170 for the modules 210, 210a,. That is, information of the module 210 (corresponding to the module ID “M-1”) is registered in the integrated data table 171. In the integrated data table 172, information of the module 210a (corresponding to the module ID “M-2”) is registered. The same applies to the following, and information on the module 210e (corresponding to the module ID “M-6”) is registered in the integrated data table 176.

In the following, only the integrated data table 171 will be described, but the integrated data tables 172,... 176 have the same structure.
The integrated data table 171 includes an item indicating the unit position, an item indicating the installation time, and an item indicating the integrated current. Information arranged in the horizontal direction of each item is associated with each other to indicate integrated information regarding one unit.

  In the item indicating the unit position, information (xy coordinate value) indicating the position of the display unit is set. In the item indicating the installation time, information indicating the installation time of the corresponding display unit is set. In the item indicating the integrated current, information indicating the integrated current of the corresponding display unit is set.

  As shown in FIG. 5, the installation time measured by the installation time timer 160 for each display unit is stored in the item indicating the installation time. In addition, in the item indicating the integrated current, a value obtained by integrating the integrated currents acquired by the integrated current counters 270, 270a,..., 270e in module units by the number of display units of each module is integrated in each display unit. Is stored.

  In the integrated data table 171, for example, information that the unit position is “(x, y) = (1, 1)”, the installation time is “36 months”, and the integrated current is “50 kAh” is set. This indicates that the installation time of the display unit 211 is “36 months” and the integrated current is “50 kAh”.

  In addition, in the integrated data table 171, for example, for the display unit 213 (position (x, y) = (3, 1)), information that the installation time is “2 months” and the integrated current is “2.5 kAh” is set. Is done. The installation time is shorter than that of the other display units and the accumulated current is small, indicating that the display unit 213 has been replaced in the past. Further, even if the installation time is the same, the accumulated current values are different because a part where the display unit is lighted and a part where the display unit is lighted are generated depending on the contents displayed on the display unit.

  The luminance correction information calculation unit 180 is based on the dirt luminance deterioration table 151 stored in the deterioration information storage unit 150, the current luminance deterioration table 152, and the integration data table 171 stored in the integration information storage unit 170. Brightness correction information is generated.

  FIG. 11 is a diagram illustrating a data structure example of the luminance correction coefficient table. The luminance correction coefficient tables 191, 192,..., 196 are stored in the luminance correction information storage unit 190 for each of the modules 210, 210a,. That is, information on the module 210 (corresponding to the module ID “M-1”) is registered in the luminance correction coefficient table 191. Information on the module 210a (corresponding to the module ID “M-2”) is registered in the luminance correction coefficient table 192. The same applies to the following, and information on the module 210e (corresponding to the module ID “M-6”) is registered in the luminance correction coefficient table 196.

Hereinafter, only the luminance correction coefficient table 191 will be described, but the luminance correction coefficient tables 192,.
The luminance correction coefficient table 191 includes an item indicating a unit position and an item indicating a luminance correction coefficient. Information arranged in the horizontal direction of each item is associated with each other to indicate correction coefficient information regarding one unit.

  In the item indicating the unit position, information (xy coordinate value) indicating the position of the display unit is set. In the item indicating the brightness correction coefficient, a correction coefficient for making the brightness uniform by multiplying the current brightness of the corresponding display unit is set.

In the brightness correction coefficient table 191, for example, information that the unit position is “(x, y) = (3, 1)” and the brightness correction coefficient is “0.89 × Z ₃ ” is set. The reference coefficient Z _n (n = 1, 2,..., 16) is used to adjust the luminance variation generated between the display units to the reference luminance of the module 210 when each display unit is not deteriorated. Parameter. As the reference coefficient Z _n , an appropriate value is predetermined for each display unit. In this case, the brightness of the other display units of the module 210 is smaller by 11% than the current brightness (reference brightness) of the display unit 213, and the correction constant “0.89 × Z ₃ ” is set to the reference brightness of the display unit 213. It is shown that the luminance of each display unit of the module 210 can be made uniform to the deteriorated luminance by setting the multiplied luminance (degraded luminance).

  The luminance correction coefficient table 191 corresponds to the integrated data table 171. That is, the luminance correction coefficient table 191 illustrates the case where the unit with the greatest luminance degradation due to the installation time and the integrated current is the display unit 226 (unit position “(x, y) = (4, 4)”). . In this case, the luminance correction coefficients of the display units 211 to 225 are determined so that the luminance matches that of the display unit 226.

Next, processing of the control device 100 having the above configuration will be described. First, processing for obtaining information on installation time and integrated current will be described.
FIG. 12 is a flowchart showing the procedure of the integrated data acquisition process. In the following, the process illustrated in FIG. 12 will be described in order of step number.

  [Step S11] The management terminal device 300 instructs the control device 100 to activate the display panel 200. Such an activation instruction is given, for example, at the start of daily system operation. Note that the management terminal device 300 and the control device 100 may activate the display panel 200 upon receiving an operation input for system activation by an operator.

  [Step S12] The integrated current counters 270, 270a,..., 270e are activated and the measurement of the integrated current is started. The integrated current counters 270, 270a,..., 270e average the current values flowing through the modules by the number of display units of each module, and integrate the display units to measure the integrated current. The installation time timer 160 always counts the installation time.

[Step S13] An operation for displaying various images on the display panel 200 is performed.
[Step S14] The management terminal device 300 instructs the control device 100 to stop the display panel 200.

[Step S15] The communication unit 120 instructs the integrated current counters 270, 270a,..., 270e to stop measuring the integrated current.
[Step S16] The installation time timer 160 records the installation time of each display unit in the integrated data table 171 stored in the integrated information storage unit 170.

  [Step S17] The accumulated current counters 270, 270a,..., 270e transmit the measured accumulated current of each display unit to the communication unit 120. The communication unit 120 records the received integrated current of each display unit in the integrated data table 171 stored in the integrated information storage unit 170.

[Step S18] The control device 100 stops the display panel 200. As a result, the display system is stopped.
As described above, the integrated current counters 270, 270a,..., 270e measure the integrated current only when the display system is operated. The installation time timer 160 always measures the installation time. Then, the control device 100 records the installation time in the integrated data table 171 at the system stop timing. In addition, the control device 100 acquires the integrated current of each display unit from the display panel 200 at this timing and records it in the integrated data table 171.

  Next, the luminance correction process of the display unit will be described. First, luminance correction processing when the display unit is replaced will be described. In the following description, it is assumed that the display unit 216 is replaced in the module 210. However, the same processing is performed for other modules and other display units.

FIG. 13 is a flowchart showing the procedure of the unit replacement correction process. In the following, the process illustrated in FIG. 13 will be described in order of step number.
[Step S <b> 21] When the management terminal device 300 obtains an instruction to execute brightness correction and the position information of the module to be corrected and the display unit by the operator's operation input, the management terminal device 300 generates a command including these and transmits the command to the control device 100. To do. Here, it is assumed that the module 210 (module ID “M−1”) is specified as the correction target module, and the replacement target is specified as the display unit 216. The brightness correction information calculation unit 180 acquires this command via the communication unit 110.

  [Step S22] The luminance correction information calculation unit 180, based on the information of the target module (for example, module ID “M-1”) included in the acquired command, the integration data table 171 stored in the integration information storage unit 170. To get.

[Step S23] The luminance correction information calculation unit 180 identifies the unit with the largest luminance deterioration based on the accumulated data table 171 and the stain luminance deterioration table 151 and the current luminance deterioration table 152 stored in the deterioration information storage unit 150. . Specifically, the following processes (1) to (4) are performed. (1) The brightness correction information calculation unit 180 refers to the stain brightness deterioration table 151 and the integrated data table 171 and acquires the stain deterioration constants of the display units 211, 212,. (2) The luminance correction information calculation unit 180 acquires the current deterioration constants of the display units 211, 212,..., 226 based on the current luminance deterioration table 152 and the integrated data table 171 stored in the deterioration information storage unit 150. To do. (3) The luminance correction information calculation unit 180 calculates a total deterioration constant obtained by summing the acquired dirt deterioration constant and current deterioration constant for each of the display units 211, 212,. The total deterioration constant is a value indicating the degree of deterioration due to dirt and integrated current of each of the display units 211, 212,. (4) The luminance correction information calculation unit 180 specifies the largest value among the total deterioration constants. Note that the stain deterioration constant that gives the maximum total deterioration constant at this time is X ₀ , and the current deterioration constant is Y ₀ .

[Step S24] The luminance correction information calculation unit 180 acquires the contamination deterioration constant X ₀ and the current deterioration constant Y ₀ for the unit with the largest luminance deterioration.
[Step S25] The luminance correction information calculation unit 180 calculates the luminance correction coefficient Z ₀ using the acquired dirt deterioration constant X ₀ and the current deterioration constant Y ₀ . Specifically, the calculation of Z ₀ = Z × (1−X ₀ −Y ₀ ) is performed. Here, Z is the reference constant described with reference to FIG. 11, and in the following, a subscript is omitted, but indicates a value related to the display unit 216. The brightness correction information calculation unit 180 stores the calculated brightness correction coefficient Z ₀ in the brightness correction coefficient table 191 as a brightness correction coefficient corresponding to the display unit 216 (position (x, y) = (2, 2)).

  [Step S <b> 26] When the information stored in the luminance correction information storage unit 190 is updated, the communication unit 120 acquires the information and transmits it to the display panel 200. Here, the communication unit 120 acquires the luminance correction coefficient table 191 from the luminance correction information storage unit 190 and transmits it to the display panel 200.

  [Step S27] The communication unit 120 determines whether or not the luminance correction of the display unit 216 has been normally executed on the display panel 200. This determination can be executed, for example, by the display unit light emission control unit 250 receiving the information indicating the success or failure of the luminance correction of the display unit 216 from the display panel 200 and confirming the content thereof. If the luminance correction has been executed normally, the process proceeds to step S28. If the luminance correction has not been executed normally, the process proceeds to step S22.

  [Step S28] The communication unit 120 operates the integration data table 171 stored in the integration information storage unit 170 to reset the installation time of the display unit 216 to “0”. At this time, the installation time for the display unit 216 of the installation time timer 160 is also reset to “0”.

  [Step S29] The communication unit 120 operates the integrated data table 171 to reset the integrated current of the display unit 216 to “0”. At this time, the integrated current relating to the display unit 216 of the integrated current counter 270 is also reset to “0”.

  In this way, when the display unit is replaced, the control device 100 displays the display unit that has the maximum luminance deterioration due to dirt and integrated current among the modules including the corresponding display unit (that is, the display unit having the lowest luminance at the present time). Is identified. Then, the luminance of the new display unit that has been replaced is matched with the luminance of the display unit that has the greatest luminance degradation.

  Thereby, even if a new display unit is included in the existing display unit after the unit replacement, the brightness of the new display unit can be accurately adjusted to be uniform with the brightness of the existing display unit.

The following example can be considered as such a case.
Consider a case where the display panel 200 is newly installed and the display unit 216 is replaced three years later. Here, in order to simplify the explanation, it is assumed that the integrated current of the display units other than the display unit 216 of the module 210 is “50 kAh”. At this time, in the other display units, if the stain deterioration constant is “0.08 (8%)” and the current deterioration constant is “0.06 (6%)”, the total deterioration constant is “0. 14 ". This indicates that luminance degradation of “14%” has occurred from the beginning of installation. Therefore, when the display unit 216 is replaced, a luminance difference of “14%” occurs between the display unit 216 and the other display units. By the process shown in FIG. 13, the brightness of the new display unit is reduced to compensate for this difference. Specifically, the luminance correction coefficient of the display unit 216 is set to Z ₀ = Z × (1−0.08−0.06) = Z × 0.86.

As described above, by performing the correction in consideration of the luminance deterioration due to the dirt and the integrated current, the luminance between the new display unit and the existing display unit can be accurately adjusted.
It should be noted that the luminance correction coefficient immediately after the unit replacement is not necessarily optimum for the subsequent correction. This is because a new display unit is deteriorated in luminance due to dirt and accumulated current after installation. For this reason, if the brightness of the new display unit is kept reduced by the brightness correction coefficient immediately after the unit replacement, the brightness of the new display unit will be higher than that of other display units due to the deterioration of brightness due to dirt and accumulated current. May be reduced, resulting in a difference in luminance. Therefore, the luminance correction coefficient of a new display unit is periodically updated to correct such a luminance difference.

  FIG. 14 is a flowchart showing the procedure of the periodic correction process. In the following, the process illustrated in FIG. 14 will be described in order of step number. It is assumed that the display unit 216 of the module 210 has been replaced. However, the same processing is performed for other modules and other display units.

  [Step S31] The luminance correction information calculation unit 180 acquires a periodic correction command including an instruction to execute luminance correction, position information of a module to be corrected and a display unit from the management terminal device 300 via the communication unit 110. The management terminal device 300 transmits this periodic correction command to the control device 100 at a predetermined cycle.

  [Step S32] The luminance correction information calculation unit 180, based on the information of the target module (for example, module ID “M-1”) included in the acquired command, the integration data table 171 stored in the integration information storage unit 170. To get.

[Step S <b> 33] The luminance correction information calculation unit 180 acquires the installation time of the display unit 216 from the integrated data table 171.
[Step S <b> 34] The brightness correction information calculation unit 180 acquires the stain deterioration constant X ₁ of the display unit 216 based on the acquired installation time and the stain brightness deterioration table 151 stored in the deterioration information storage unit 150.

[Step S <b> 35] The luminance correction information calculation unit 180 acquires the integrated current of the display unit 216 from the integrated data table 171.
[Step S36] The luminance correction information calculation unit 180 acquires the current deterioration constant Y ₁ of the display unit 216 based on the acquired integrated current and the current luminance deterioration table 152 stored in the deterioration information storage unit 150.

  [Step S37] The luminance correction information calculation unit 180 identifies the unit with the highest luminance degradation based on the accumulated data table 171 and the contamination luminance degradation table 151 and the current luminance degradation table 152 stored in the degradation information storage unit 150. . Specifically, the processes (1) to (4) in step S23 of FIG. 13 are executed.

[Step S38] The luminance correction information calculation unit 180 acquires the contamination deterioration constant X ₀ and the current deterioration constant Y ₀ for the unit with the highest luminance deterioration.
[Step S39] The luminance correction information calculation unit 180 calculates a luminance correction coefficient Z ₀ using the acquired dirt deterioration constants X ₀ and X ₁ and current deterioration constants Y ₀ and Y ₁ . Specifically, Z ₀ = Z × (1− (X ₀ −X ₁ ) − (Y ₀ −Y ₁ )) is calculated. The brightness correction information calculation unit 180 stores the calculated brightness correction coefficient Z ₀ in the brightness correction coefficient table 191 as a brightness correction coefficient corresponding to the display unit 216 (position (x, y) = (2, 2)).

[Step S <b> 40] The communication unit 120 acquires the brightness correction coefficient table 191 from the brightness correction information storage unit 190 and transmits it to the display panel 200.
[Step S41] The communication unit 120 determines whether or not the luminance correction of the display unit 216 has been normally executed on the display panel 200. In this determination, as in step S27 of FIG. 13, the display unit light emission control unit 250 receives information indicating whether or not the luminance correction of the display unit 216 by the luminance correction coefficient table 191 is successful from the display panel 200, and confirms the content. Can be executed. When the brightness correction is normally executed, the process is completed. If the luminance correction has not been executed normally, the process proceeds to step S32.

  As described above, the control device 100 periodically corrects the brightness based on the contamination and the accumulated current with respect to the newly installed display unit after replacement. As a result, even if the newly installed display unit is deteriorated due to dirt and accumulated current in addition to the luminance reduction due to the correction immediately after replacement, even if it becomes smaller than the luminance of other display units, the difference in luminance is reduced. Correction can be made with high accuracy.

The following example can be considered as such a case.
Assume that correction is made to reduce the luminance of the display unit 216 by “14%” from the reference luminance in order to match the luminance with other display units of the module 210 immediately after the display unit 216 is replaced. Then, consider a case where the accumulated current is accumulated “10 kAh” in each display unit one year later. At this time, the installation time of the other display unit is “6 years”, the dirt deterioration constant corresponding to this is “0.09 (9%)”, the integrated current is “60 kAh”, and the current deterioration constant corresponding thereto. Is “0.08 (8%)”. Further, regarding the display unit 216, the contamination deterioration constant corresponding to the installation time “1 year” is “0.07 (7%)”, and the current deterioration constant corresponding to the integrated current “10 kAh” is “0.01. (1%) ”. In this case, the total deterioration constant of each of the other display units is “0.09 + 0.08 = 0.17”. That is, the luminance degradation of “17%” has occurred from the reference luminance. On the other hand, in the display unit 216, including the reduction correction immediately after replacement, “0.14 + 0.07 + 0.01 = 0.22”. That is, the luminance degradation of “22%” from the reference luminance (however, the reduction immediately after replacement is included) has occurred. For this reason, the brightness of the display unit 216 is smaller by “5%” than the other display units. Therefore, the control device 100 only needs to loosen the reduction correction of the display unit 216 by this amount in order to make the luminance of each display unit uniform. Specifically, the luminance correction coefficient of the display unit 216 is updated to Z ₀ = Z × (1− (0.09−0.07) − (0.08−0.01)) = Z × 0.91. . In this way, the control device 100 can keep the luminance of each display unit uniform even if the display unit is replaced.

  In addition, as for the display units that have not been replaced, as shown in the integrated data table 171, the integrated current varies. For this reason, the display unit other than the display unit 216 is periodically subjected to the periodic correction processing of FIG. 14 to obtain the brightness correction coefficient of each display unit as shown in the brightness correction coefficient table 191. As described above, when the luminance correction processing is periodically performed for all the display units, the luminance of each display unit can be kept more uniform.

  Note that the luminance deterioration due to dirt is eliminated by cleaning the display unit, for example. For this reason, even when the display unit is cleaned, it is necessary to correct the luminance of the replaced display unit. Hereinafter, the luminance correction process immediately after cleaning the display unit will be described.

  FIG. 15 is a flowchart showing the procedure of the cleaning correction process. In the following, the process illustrated in FIG. 15 will be described in order of step number. It is assumed that the display unit 216 of the module 210 has been exchanged in the past. However, the same processing is performed for other modules and other display units.

  [Step S51] When the display panel 200 is cleaned, the management terminal device 300 receives a predetermined operation input by the operator and transmits a cleaning completion notification including an installation time reset command to the control device 100. The installation time timer 160 receives this reset command via the communication unit 110 and resets the installation time of all the display units to “0”. The installation time timer 160 updates the installation times of all display units in the integration data table 171 stored in the integration information storage unit 170 to “0”.

  [Step S52] The luminance correction information calculation unit 180 acquires a command including a luminance correction execution instruction, a correction target module, and position information of the display unit from the management terminal device 300 via the communication unit 110.

  [Step S <b> 53] The luminance correction information calculation unit 180 is based on the information (for example, module ID “M−1”) of the target module included in the acquired command, and the integration data table 171 stored in the integration information storage unit 170. To get.

[Step S <b> 54] The luminance correction information calculation unit 180 acquires the integrated current of the display unit 216 from the integrated data table 171.
[Step S55] The luminance correction information calculation unit 180 acquires the current deterioration constant Y ₁ of the display unit 216 based on the acquired integrated current and the current luminance deterioration table 152 stored in the deterioration information storage unit 150.

[Step S56] The luminance correction information calculation unit 180, based on the current luminance deterioration table 152 stored in the integration data table 171 and the deterioration information storage unit 150, has the largest current deterioration constant Y among the current deterioration constants of the respective display units. _{Get 0} .

[Step S57] The luminance correction information calculation unit 180 calculates the luminance correction coefficient Z ₀ using the acquired current deterioration constants Y ₀ and Y ₁ . Specifically, Z ₀ = Z × (1− (X ₀ −X ₁ )) is calculated. The brightness correction information calculation unit 180 stores the calculated brightness correction coefficient Z ₀ in the brightness correction coefficient table 191 as a brightness correction coefficient corresponding to the display unit 216 (position (x, y) = (2, 2)).

[Step S <b> 58] The communication unit 120 acquires the luminance correction coefficient table 191 from the luminance correction information storage unit 190 and transmits it to the display panel 200.
[Step S59] The communication unit 120 determines whether or not the luminance correction of the display unit 216 has been normally executed on the display panel 200. In this determination, as in step S27 of FIG. 13, the display unit light emission control unit 250 receives information indicating whether or not the luminance correction of the display unit 216 by the luminance correction coefficient table 191 is successful from the display panel 200, and confirms the content. Can be executed. When the brightness correction is normally executed, the process is completed. If the luminance correction has not been executed normally, the process proceeds to step S52.

  Thus, when the display panel 200 is cleaned, the installation time of the integrated data table 171 is reset, and the luminance is corrected for the replaced display unit. Thereby, even after cleaning the display panel 200, the brightness of each display unit can be maintained accurately and uniformly.

The following example can be considered as such a case.
Assume that the display panel 200 is cleaned immediately after the periodic correction is executed in the case described with reference to FIG. In this case, the installation time is reset and the installation time of each display unit of the module 210 is reset to “0”. Then, in the display units other than the display unit 216, only the luminance deterioration due to the integrated current “60 kAh” occurs. That is, the total deterioration constant at this time is “0.08”, which means that the luminance deterioration of “8%” has occurred from the reference luminance. On the other hand, in the display unit 216, the luminance is smaller than the reference luminance by adding up the luminance deterioration due to the integrated current “10 kAh” and the periodically corrected reduction correction amount (1−0.91 = 0.09). . That is, the luminance degradation amount of the display unit 216 is “0.09 + 0.01 = 0.10”, which means that the luminance degradation is “10%” than the reference luminance. For this reason, the display unit 216 is lower in luminance by “2%” than the other display units. Therefore, the control device 100 only needs to loosen the reduction correction of the display unit 216 by this amount in order to make the luminance of each display unit uniform. Specifically, the brightness correction coefficient of the display unit 216 is updated to Z ₀ = Z × (1− (0.08−0.01)) = Z × 0.93. In this way, the control device 100 can keep the luminance of each display unit uniform even when the display panel 200 is cleaned.

In this way, the control device 100 individually evaluates the luminance degradation due to dirt and the luminance degradation due to the integrated current, and corrects the luminance of each display unit to be uniform with the surrounding display units.
Thereby, the accuracy of luminance correction can be improved.

  For example, conventionally, when the luminance deterioration of the display unit is obtained, the display unit 200 is obtained based on the operating time. However, the display panel 200 does not always display an image. For this reason, in the conventional method, the time during which the display unit is not actually energized is also taken into account, and an error has occurred between the actual luminance degradation.

  On the other hand, in the control apparatus 100, the current luminance deterioration is obtained from the integrated current of each display unit measured by the integrated current counters 270, 270a, ..., 270e of the display panel 200. Therefore, the deterioration due to the integrated current can be appropriately reflected in the calculation of the luminance deterioration, and the luminance deterioration can be obtained more accurately.

  In addition, when the display panel 200 is installed outdoors, luminance degradation due to dirt such as dust accumulated on the surface of the display unit is large. For this reason, it is important for luminance correction to appropriately evaluate luminance deterioration due to such contamination.

  That is, the control device 100 accurately obtains the luminance difference between the display units by individually evaluating the influence of these factors (dirt and accumulated current) that greatly contribute to the luminance degradation of each display unit. be able to. Thereby, even if the display unit is replaced, the difference in luminance between the display units can be accurately corrected.

  In addition, after the display unit is replaced, the control device 100 periodically performs brightness correction on the newly installed display unit. As a result, the brightness of the newly installed display unit is smaller than the brightness of the existing display unit even if the display unit is newly installed and the brightness deteriorates due to dirt or integrated current after replacement. Can be prevented.

  Furthermore, the control apparatus 100 resets the installation time of each display unit when the display panel 200 is cleaned. And the control apparatus 100 performs brightness | luminance correction | amendment by the information after installation time reset regarding the display unit newly installed by replacement | exchange. Thereby, it is possible to compensate for a difference in luminance that may be caused by cleaning between the display unit that is newly installed after replacement and another display unit.

  As described above, the display device and the display method of the present invention have been described based on the illustrated embodiments. However, the present invention is not limited thereto, and the configuration of each unit may be replaced with an arbitrary configuration having the same function. it can. Moreover, other arbitrary structures and processes may be added. Further, the present invention may be a combination of any two or more configurations (features) of the above-described embodiments.

DESCRIPTION OF SYMBOLS 1 Display apparatus 1a Dirt degradation information storage part 1b Installation time measurement part 1c Dirt degradation value determination part 1d Current degradation information storage part 1e Accumulated current measurement part 1f Current degradation value determination part 1g Brightness adjustment part 10 Display board 11, 12, 13, 14, 15, 16, 17, 18, 19 Display unit

Claims (5)

A display device comprising a plurality of display units in which one or more display elements are arranged, and displaying an image by causing the display elements to emit light,
The stain deterioration information stored in the stain deterioration information storage unit that stores stain deterioration information that associates the installation time of the display unit with the stain deterioration value indicating the degree of luminance deterioration due to the stain of the display unit, and the installation A stain deterioration value determining unit that determines the stain deterioration value of each display unit based on the installation time of each display unit accumulated by a time measurement unit;
The current deterioration stored in the current deterioration information storage unit that stores current deterioration information in which the integrated current flowing through the display unit and the current deterioration value indicating the degree of luminance deterioration due to the integrated current of the display unit are associated with each other. A current deterioration value determining unit that determines the current deterioration value of each display unit based on the information and the integrated current of each display unit integrated by the integrated current measuring unit;
The brightness difference between the display units is corrected based on the stain deterioration value determined by the stain deterioration value determination unit for each display unit and the current deterioration value determined by the current deterioration value determination unit. A brightness adjustment unit;
A display device comprising:   The luminance adjustment unit calculates a total deterioration value obtained by summing the dirt deterioration value and the current deterioration value of each display unit, and indicates a luminance after deterioration of each display unit based on the total deterioration value. The display device according to claim 1, wherein a minimum value is specified among the deteriorated luminances, and the luminance of each display unit is corrected to be the minimum value.   The brightness adjustment unit, when at least one of the display units is replaced, corrects the difference in brightness at a predetermined period for a display unit newly installed by the replacement. The display device according to any one of 1 and 2. When each display unit is cleaned, the display unit further includes an operation unit that receives a predetermined operation input and outputs a cleaning completion notification indicating that the cleaning has been performed,
When the brightness adjustment unit acquires the cleaning completion notification output by the operation unit, the installation time measuring unit resets the installation time.
The display device according to claim 1, wherein the display device is a display device. A display method of a display device comprising a plurality of display units in which one or more display elements are arranged, and displaying the image by causing the display elements to emit light,
The stain deterioration value determination unit is stored in a stain deterioration information storage unit that stores stain deterioration information in which an installation time of the display unit and a stain deterioration value indicating a degree of luminance deterioration due to the stain of the display unit are associated with each other. Based on the contamination deterioration information and the installation time of each display unit accumulated by the installation time measurement unit, determine the contamination deterioration value of each display unit,
A current deterioration information storage unit that stores current deterioration information in which the current deterioration value determining unit associates the integrated current flowing through the display unit with the current deterioration value indicating the degree of luminance deterioration due to the integrated current of the display unit. Determining the current deterioration value of each display unit based on the current deterioration information stored in and the integrated current of each display unit integrated by the integrated current measuring unit,
The brightness adjustment unit is configured to determine the brightness between the display units based on the stain deterioration value determined by the stain deterioration value determination unit and the current deterioration value determined by the current deterioration value determination unit for each display unit. To compensate for the difference between
A display method characterized by that.

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