JPWO2019092774A1 - Display system, display device, and display control device - Google Patents

Abstract

The specific display device 100 transmits the first correction luminance that is the correction luminance of the specific display device 100 to the display control device 200. The other display device 100 transmits the second corrected luminance that is the corrected luminance of the other display device 100 to the display control device 200. The calculation unit 25 of the display control device 200 uses a correction coefficient for reflecting the first correction luminance and the second correction luminance in the correction of the video data to be corrected based on the first correction luminance and the second correction luminance. To calculate.

Description

  The present invention relates to a display system, a display device, and a display control device having a plurality of LEDs (Light Emitting Diodes).

  The LED display device having an LED has been increasingly used for advertisement display in the outdoors or indoors in accordance with the technological development and cost reduction of the LED. Until now, LED display devices have mainly displayed natural images and animated moving images. However, in recent years, for example, LED display devices for indoor applications such as conference room display applications and monitoring applications, in particular, LED display apparatuses for monitoring applications, are becoming narrower. Therefore, the viewing distance of the LED display device is shortened. As a result, for example, personal computer images close to still images are often displayed on LED display devices.

  By the way, the brightness | luminance of LED falls, so that the accumulation lighting time of the said LED becomes long. For this reason, the luminance decrease rate of each LED differs depending on the content of the image, the arrangement position of the LED, and the like. As a result, luminance variation and color variation occur for each pixel.

  Therefore, Patent Documents 1 and 2 disclose techniques for reducing luminance variation and color variation. Patent Document 1 discloses a configuration for correcting display data (hereinafter also referred to as “related configuration A”) based on a luminance correction coefficient of each LED included in an LED display unit. Patent Document 2 discloses a configuration for correcting the luminance of an LED based on an accumulated lighting time obtained by accumulating the LED lighting time (hereinafter also referred to as “related configuration B”).

Japanese Patent Laid-Open No. 11-015437 JP 2006-330158 A

  In recent years, an opportunity to use a configuration using a plurality of display devices (LED display devices) is increasing. In this configuration, it is desired to suppress luminance variation among a plurality of display devices. Each display device generally stores a luminance correction coefficient as in the related configuration A in order to suppress luminance variation in the display device.

  In order to suppress the luminance variation among the plurality of display devices, in consideration of the luminance of the LED of each display device corrected by the luminance correction coefficient of each display device (hereinafter also referred to as “corrected luminance”), A configuration for correcting video data is required. The related configurations A and B for one display device cannot satisfy this requirement.

  The present invention has been made to solve such a problem, and an object thereof is to provide a display system or the like having a configuration for correcting video data based on a plurality of correction luminances.

  In order to achieve the above object, a display system according to an aspect of the present invention includes a plurality of display devices having a screen formed of a plurality of LEDs, and a display control device that communicates with the plurality of display devices. Each display device uses a brightness correction coefficient for use in correcting the brightness of each LED, a correction brightness that is the brightness of each LED corrected by the brightness correction coefficient, and individual information of the display device A storage unit for storing, and a specific display device of the plurality of display devices transmits a first correction luminance which is the correction luminance of the specific display device to the display control device, and the plurality of display devices Among the display devices other than the specific display device, the display control device transmits the second correction luminance, which is the correction luminance of the other display device, to the display control device. The display control device manages a plurality of the individual information corresponding to the device, and the display control device uses a correction coefficient for reflecting the first correction luminance and the second correction luminance in the correction of the video data to be corrected. Correction brightness The display unit includes a calculation unit configured to calculate based on the second corrected luminance, and each display device includes the plurality of LEDs based on the correction target video data corrected based on the luminance correction coefficient and the correction coefficient. It further has a drive part which drives.

  According to the present invention, the specific display device transmits the first corrected luminance to the display control device. The other display device transmits the second corrected luminance to the display control device. The calculation unit of the display control device sets a correction coefficient for reflecting the first correction luminance and the second correction luminance in the correction of the video data to be corrected to the first correction luminance and the second correction luminance. Calculate based on

  The correction coefficient is a coefficient for reflecting the first correction luminance and the second correction luminance in the correction of the video data to be corrected. That is, the correction coefficient is a coefficient used in correcting video data. The correction coefficient is calculated based on the first correction luminance and the second correction luminance. Therefore, the configuration for calculating the correction coefficient used in the correction of the video data based on the first correction luminance and the second correction luminance is a configuration for correcting the video data based on the plurality of correction luminances. Equivalent to. Therefore, it is possible to provide a display system having a configuration for correcting video data based on a plurality of corrected luminances.

  Objects, features, aspects, and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

It is a block diagram which shows the structure of the display system which concerns on Embodiment 1 of this invention. It is a front view of all the display apparatus arrays which concern on Embodiment 1 of this invention. It is a block diagram which shows the structure of the display apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the display control apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the drive of a PWM system. It is a figure which shows the brightness | luminance maintenance factor of green LED with respect to the cumulative lighting time of LED. It is a figure which shows the table which shows the brightness | luminance maintenance factor of red, green, and blue LED with respect to the cumulative lighting time of LED. It is a block diagram which shows the characteristic function structure of a display system. It is a hardware block diagram of a display control apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same components are denoted by the same reference numerals. The names and functions of the components having the same reference numerals are the same. Therefore, a detailed description of some of the components having the same reference numerals may be omitted.

<Embodiment 1>
FIG. 1 is a block diagram showing a configuration of a display system 1000 according to Embodiment 1 of the present invention. In FIG. 1, the X direction and the Y direction are orthogonal to each other. The X direction and the Y direction shown in the following figures are also orthogonal to each other. Hereinafter, a direction including the X direction and the direction opposite to the X direction (−X direction) is also referred to as “X axis direction”. In the following, the direction including the Y direction and the direction opposite to the Y direction (−Y direction) is also referred to as “Y-axis direction”. Hereinafter, a plane including the X-axis direction and the Y-axis direction is also referred to as an “XY plane”.

  Referring to FIG. 1, display system 1000 includes an entire display device array 500 and a display control device 200. FIG. 2 is a front view of all display device array 500 according to Embodiment 1 of the present invention.

  The entire display device array 500 includes a plurality of display devices 100 as display units. Each of the plurality of display devices 100 has the same configuration, details of which will be described later. The entire display device array 500 includes, for example, 36 display devices 100. Note that the number of display devices 100 constituting the entire display device array 500 is not limited to 36, and may be 2 to 35, or 37 or more.

  The entire display device array 500 is an array formed by arranging 36 display devices 100 as an example in a 6 × 6 matrix as shown in FIG. 1. The 36 display devices 100 are set with ID numbers. Hereinafter, the ID number is also simply referred to as “ID”. FIG. 1 shows a state where IDs 1 to 36 are set in 36 display devices 100 so as not to overlap each other.

  The 36 display devices 100 are classified into three groups as an example so that video signal distribution and control signal communication can be efficiently performed. Specifically, the entire display device array 500 is composed of display device groups G1, G2, and G3. Each of the display device groups G1, G2, and G3 includes twelve display devices 100. The twelve display devices 100 constituting each of the display device groups G1, G2, and G3 are daisy chain connected by a communication cable (not shown).

  Hereinafter, the order in which information (data) is transmitted in the plurality of display devices 100 connected in a daisy chain is also referred to as “transmission order”. For example, the order (transmission order) in which information (data) is transmitted in the plurality of display devices 100 is defined by the daisy chain connection in the plurality of display devices 100 constituting the display device group G1.

  In the following, communication according to the above-described transmission order is also referred to as “daisy chain communication”. In daisy chain communication, information (data) is transmitted in a plurality of display devices 100 connected in a daisy chain according to a transmission order. In daisy chain communication, for example, information (data) is transmitted in the transmission order according to the arrows in FIG. For example, in the display device group G1, information is displayed in the order of twelve display devices 100 whose IDs are set to 6, 5, 4, 3, 2, 1, 7, 8, 9, 10, 11, 12. (Data) is transmitted.

  In the following, the number indicating the transmission order is also referred to as “order number n” or “order number”. “N” is a natural number. The sequence number n is the order in which data is transmitted in the plurality of display devices 100 constituting each of the display device groups G1, G2, and G3. For example, in the display device group G1, the order number n of the display device 100 whose ID is 6 is 1, and the order number n of the display device 100 whose ID is 5 is 2. Hereinafter, the display device 100 having the order number n is also referred to as “first display device”.

  Each of the display device groups G1, G2, and G3 is configured to be able to communicate with the display control device 200. Each of the display device groups G1, G2, and G3 performs daisy chain communication. Therefore, the display control device 200 communicates with a plurality of display devices 100 included in the entire display device array 500.

  The display device 100 is, for example, an LED display device. The shape of each display device 100 is a rectangular parallelepiped. The plurality of display devices 100 are arranged in a matrix on the XY plane as shown in FIG. The shape of each display device 100 may be a shape other than a rectangular parallelepiped as long as the display devices 100 can be arranged in a matrix.

  Each display device 100 has a screen 10. As shown in FIG. 2, the entire display device array 500 includes a multi-screen 10 </ b> A. The shape of the multi-screen 10A is a rectangle. The multi-screen 10A is parallel to the XY plane. As illustrated in FIG. 2, the multi-screen 10 </ b> A is a single screen configured by arranging a plurality of screens 10 included in each of the plurality of display devices 100 in a matrix. The number of screens 10 constituting the multi-screen 10A is not limited to 36, and may be 2 to 35, or 37 or more.

  Note that the screen 10 of each display device 100 is disposed on the entire front surface of the display device 100 as an example. Therefore, the shape of the multi-screen 10A in FIG. 2 is the same as the shape of the XY plane of the entire display device array 500 in FIG.

  The plurality of display devices 100 are arranged in a matrix so that the screens 10 of the plurality of display devices 100 constitute a rectangular multi-screen 10A. All the display device arrays 500 display images on the multi-screen 10 </ b> A as each display device 100 displays images on the screen 10. The video shows, for example, characters, figures and the like.

  The screen 10 is composed of a plurality of LEDs 5 as pixels. The screen 10 is configured by arranging k pixels (LEDs 5) in a matrix of 180 rows and 320 columns. “K” is a value obtained by an equation of 320 × 180 as an example. That is, the screen 10 is composed of 320 × 180 pixels.

  The multi-screen 10A is configured by arranging m pixels (LEDs 5) in a matrix of 1080 rows and 1920 columns. “M” is a value obtained by the equation of 1920 × 1080. That is, the multi-screen 10A is composed of 1920 × 1080 pixels. Therefore, the multi-screen 10A can display a full HD image.

  The display control device 200 has a function of displaying a video on the multi-screen 10A of the entire display device array 500 by distributing a video signal to each display device 100 and transmitting / receiving a control signal to / from the display device 100. It is.

  Next, the configuration of the display device 100 will be described. FIG. 3 is a block diagram showing a configuration of display device 100 according to Embodiment 1 of the present invention. In the following description, it is assumed that the sequence number n of the display device 100 is a natural number of 2 or more.

  As shown in FIG. 3, the display device 100 includes an input terminal 2, a video signal processing circuit 3, a drive unit 4, a display unit 50, a terminal 6, a microcomputer 7, a storage unit 8, and a communication unit 9.

  The display unit 50 has the screen 10 described above. Each LED 5 constituting the screen 10 includes LEDs 5sr, 5sg, and 5sb as sub-pixels. Hereinafter, each of red, green, and blue is also referred to as a “reference color”. In the following, red, green, and blue are also referred to as R, G, and B, respectively. Hereinafter, red light, green light, and blue light are also referred to as R light, G light, and B light, respectively. The LEDs 5sr, 5sg, and 5sb emit R light, G light, and B light, respectively. Hereinafter, the luminance of R light, the luminance of G light, and the luminance of B light are also referred to as R luminance, G luminance, and B luminance, respectively. That is, the R luminance is the luminance of the LED 5sr. Moreover, G brightness | luminance is the brightness | luminance of LED5sg. The B luminance is the luminance of the LED 5sb.

  Hereinafter, each of the LEDs 5sr, 5sg, and 5sb is also referred to as “LED 5s”. That is, the screen 10 is composed of (k × 3) LEDs 5s. Further, the multi-screen 10A is composed of s LEDs 5s. “S” is a value obtained by the formula of 1920 × 1080 × 3.

  The LED 5 emits light (hereinafter also referred to as “combined light”) obtained by combining the red light, the green light, and the blue light emitted from the LEDs 5 sr, 5 sg, and 5 sb. Below, the brightness | luminance of the synthetic light which LED5 inject | emits is also called "the brightness | luminance of LED5."

  In the following, a video to be displayed on the entire multi-screen 10A is also referred to as “video Im”. The video Im is represented by an R image, a G image, and a B image. The resolutions of the R image, the G image, and the B image are the same. The R image is a red component image included in the video Im. The G image is an image of a green component included in the video Im. The B image is a blue component image included in the video Im.

  The input terminal 2 receives a video signal from the display device 100 or the display control device 200 having the sequence number (n−1). The video signal is a signal including video data indicating the video Im to be displayed on the multi-screen 10A.

  The video signal processing circuit 3 performs a selection process on the video signal received at the input terminal 2. In the selection process, the video signal processing circuit 3 selects a video area to be displayed by one display unit 50 corresponding to the video signal processing circuit 3 from the video Im included in the video signal. Hereinafter, the video area selected by the selection process in the video Im is also referred to as “partial video”. The partial video is a part of the video displayed on the entire multi-screen 10A. For example, the partial video of the display device 100 with an ID of 6 is a video for display within a square indicating “ID = 6” in FIG. Hereinafter, a video signal indicating a partial video is also referred to as a “partial video signal”.

  The drive unit 4 drives the display unit 50 based on the partial video signal so that the partial video is displayed on the display unit 50 (screen 10). The drive unit 4 drives the display unit 50 by a PWM (Pulse Width Modulation) method. Thereby, the brightness | luminance of LED5sr, 5sg, 5sb of each LED5 contained in the display part 50 is controlled. As a result, the partial video is displayed on the display unit 50 (screen 10).

  The terminal 6 receives a control signal from the display device 100 or the display control device 200 with the sequence number (n−1). The control signal is a signal including control data such as a luminance correction coefficient.

  The communication unit 9 is configured to be able to communicate with the display control device 200 via the terminal 6. The communication unit 9 transmits the control signal received from the display control device 200 to the microcomputer 7. Further, the communication unit 9 transmits the control signal received from the microcomputer 7 to the display control device 200.

  Hereinafter, the coefficient used for correcting the luminance of the LED 5s (LED 5) is also referred to as “luminance correction coefficient”. That is, the luminance correction coefficient is a coefficient used for correcting the luminance of the LED 5s (LED 5). Hereinafter, the brightness correction coefficient calculated individually for each display device 100 is also referred to as “individual brightness correction coefficient”. The individual luminance correction coefficient is a coefficient for suppressing luminance variation and chromaticity variation in the display device 100. Hereinafter, the luminance of each LED 5s corrected by the luminance correction coefficient is also referred to as “corrected luminance”.

  The storage unit 8 is a memory that stores data and the like. The storage unit 8 stores various parameters. For example, the storage unit 8 stores a plurality of individual luminance correction coefficients, a plurality of correction luminances, other necessary setting values and adjustment values, and the like as parameters.

  The storage unit 8 stores individual information of the display device 100 including the storage unit 8. The individual information is unique information for identifying the display device 100. Specifically, the individual information is information for identifying each of the plurality of display devices 100 constituting the entire display device array 500. Each of the plurality of display devices 100 constituting the entire display device array 500 corresponds to a plurality of pieces of individual information.

  The individual information is, for example, a serial number. Individual information of each display device 100 included in the entire display device array 500 indicates a different serial number. The individual information is not limited to the serial number, and may be other information as long as it is unique information for identifying the display device 100.

  The microcomputer 7 comprehensively controls each component of the display device 100. The microcomputer 7 performs control of the video signal processing circuit 3, control of the drive unit 4, control of the communication unit 9, data access to the storage unit 8, and the like.

  As described above, the storage unit 8 stores a plurality of individual luminance correction coefficients and a plurality of correction luminances. Each individual luminance correction coefficient and each corrected luminance indicate values for making the luminance and chromaticity of the partial video displayed by the display unit 50 of the display device 100 uniform for each display device 100.

  In order to realize this, each individual luminance correction coefficient and each corrected luminance are set with values adjusted in advance by an operator in the adjustment process before the display system 1000 as a product is shipped from the factory. In the adjustment process, for example, the operator measures and corrects the R luminance, the G luminance, and the B luminance in each pixel (LED 5) included in the display unit 50, whereby each individual luminance correction coefficient value and each correction are corrected. The brightness value is adjusted.

  Note that the storage unit 8 of each display device 100 included in the entire display device array 500 stores the individual luminance correction coefficient and the corrected luminance that are individually adjusted for the display device 100.

  Hereinafter, the position of the pixel in the horizontal direction on the screen 10 is also referred to as “position uh” or “uh”. A value from 0 to 319 is set in “uh”. Hereinafter, the position of the pixel in the vertical direction on the screen 10 is also referred to as “position uv” or “uv”. A value from 0 to 179 is set in “uv”. In the following, the coordinates (position) of the pixels on the screen 10 of each display device 100 are expressed as “coordinates Pu (uh, uv)”, “coordinates Pu”, or “(uh, uv)”.

  In the following, on the screen 10 of each display device 100, the R luminance, G luminance, and B luminance before correction in the pixel (LED 5) specified by the coordinates Pu (uh, uv) are respectively Yr (uh, uv), Yg (uh, uv), Yb (uh, uv). The R luminance, G luminance, and B luminance before the correction are respectively the R luminance, G luminance, and B luminance of each LED 5 in the maximum gradation state. The maximum gradation state is a state in which the LED 5 emits white light as synthesized light.

  In the following, the minimum values of R luminance, G luminance, and B luminance before correction in each display device 100 are expressed as Yr_min, Yg_min, and Yb_min, respectively. In the following, the LED 5 present at the coordinates Pu (uh, uv) is also referred to as a “coordinate Pu corresponding LED”.

  Hereinafter, the individual luminance correction coefficient for correcting the R luminance of the LED corresponding to the coordinate Pu is also referred to as “individual luminance correction coefficient Cr” or “Cr”. In the following, the individual luminance correction coefficient for correcting the G luminance of the LED corresponding to the coordinate Pu is also referred to as “individual luminance correction coefficient Cg” or “Cg”. Hereinafter, the individual luminance correction coefficient for correcting the B luminance of the LED corresponding to the coordinate Pu is also referred to as “individual luminance correction coefficient Cb” or “Cb”.

  In the following, the solid R image is also referred to as “solid image Br”. In the following, the solid image of G is also referred to as “solid image Bg”. In the following, the B solid image is also referred to as “solid image Bb”. In the following, the white solid image is also referred to as “solid image Bw”. The solid image Bw is expressed by solid images Br, Bg, and Bb. Hereinafter, the state in which the solid image Bw is displayed on the entire screen 10 is also referred to as a “solid image display state”.

  The individual brightness correction coefficients Cr, Cg, and Cb are coefficients for making the brightness of each LED 5 uniform in each display device 100. Specifically, the individual brightness correction coefficients Cr, Cg, and Cb are coefficients for making the brightness of each LED 5 representing the solid image Bw the same in each display device 100 in the solid image display state.

  In the following, the individual luminance correction coefficients Cr, Cg, and Cb of the pixel (LED5) specified by the coordinates Pu (uh, uv) are represented by Cr (uh, uv), Cg (uh, uv), and Cb, respectively. Expressed as (uh, uv). The individual luminance correction coefficients Cr (uh, uv), Cg (uh, uv), and Cb (uh, uv) are expressed by the following formula 1.

  When each display device 100 corrects the luminance (R luminance, G luminance, B luminance) of each LED 5 using the individual luminance correction coefficients Cr, Cg, Cb, R as the corrected luminance of each LED 5 The luminance, G luminance, and B luminance are Yr_min, Yg_min, and Yb_min, respectively. As a result, the R luminance, G luminance, and B luminance of the LED 5 having high luminance are lowered.

  In the first embodiment, as described above, the individual luminance correction coefficients Cr (uh, uv), Cg (uh, uv), Cb (uh, uv) and corrected luminances Yr_min, Yg_min, Yb_min of each pixel on the screen 10 as described above. Is stored in the storage unit 8 in advance. Under the control of the microcomputer 7, the communication unit 9 transmits each individual luminance correction coefficient and each corrected luminance stored in the storage unit 8 to the display control device 200.

  FIG. 4 is a block diagram showing a configuration of display control apparatus 200 according to Embodiment 1 of the present invention. As shown in FIG. 4, the display control device 200 includes an input terminal 30, a video signal processing circuit 11, a brightness correction unit 12, a control circuit 13, video signal division transfer units 14, 15, 16, video output terminals 17, 18, 19, an external control terminal 20 and control terminals 21, 22, and 23 are provided.

  The input terminal 30 receives a video signal from the outside.

  The video signal processing circuit 11 performs image processing such as gamma correction on the video signal received by the input terminal 30. The luminance correction unit 12 corrects the luminance of the video signal processed by the video signal processing circuit 11.

  The video signal division transfer units 14, 15, and 16 are connected to the input terminal 2 (FIG. 3) of the first display device of the display device groups G1, G2, and G3 via the video output terminals 17, 18, and 19, respectively. Yes. The video signal division transfer units 14, 15, and 16 divide the video signal corrected by the luminance correction unit 12 into three video signals to be displayed on the display device groups G1, G2, and G3, respectively. Then, the video signal division transfer units 14, 15, and 16 transmit the divided three video signals to the first display devices of the display device groups G1, G2, and G3, respectively.

  The external control terminal 20 receives a control signal for controlling the display control device 200 and the display device 100 from an external PC (Personal Computer) or the like.

  The control circuit 13 is, for example, a CPU (Central Processing Unit). The control circuit 13 is connected to the terminal 6 (FIG. 3) of the first display device of the display device group G1, G2, G3 via the control terminals 21, 22, 23, respectively. Accordingly, the control circuit 13 can control the entire display device array 500 by transmitting a control signal to the entire display device array 500 or receiving a control signal from the entire display device array 500.

  Further, the control circuit 13 can control the correction of the video signal in the luminance correction unit 12 based on the control signal received at the external control terminal 20 and the control signal transmitted from the entire display device array 500. It has become.

  The control circuit 13 of FIG. 4 includes a lighting time storage unit 24, a correction coefficient calculation unit 25, an external control communication unit 26, an internal communication control unit 27, and a parameter storage unit 28. All or part of the correction coefficient calculation unit 25, the external control communication unit 26, and the internal communication control unit 27 may be configured by hardware such as LSI (Large Scale Integration). In addition, all or part of the correction coefficient calculation unit 25, the external control communication unit 26, and the internal communication control unit 27 may be a program module executed by a processor such as a CPU.

  The display control device 200 (lighting time storage unit 24) manages the cumulative lighting time obtained by accumulating the lighting times of the s LEDs 5s constituting the multi-screen 10A of the entire display device array 500 in FIG. “S” is an integer of 2 or more. “S” is a value obtained by the formula of 1920 × 1080 × 3.

  In other words, the lighting time storage unit 24 stores the cumulative lighting time of the s LEDs 5s constituting the multi-screen 10A of the entire display device array 500. That is, the display control device 200 manages the accumulated lighting time obtained by accumulating the lighting times of the plurality of LEDs 5s of the display devices 100 included in the entire display device array 500.

  The external control communication unit 26 stores parameters included in the control signal received at the external control terminal 20 in the parameter storage unit 28 or transmits the parameters to the internal communication control unit 27. Further, the external control communication unit 26 transmits the parameters stored in the parameter storage unit 28 and the parameters received from the internal communication control unit 27 to the outside via the external control terminal 20.

  The internal communication control unit 27 stores parameters included in the control signals received at the control terminals 21, 22, 23 in the parameter storage unit 28, transmits them to the external control communication unit 26, and sends them to the correction coefficient calculation unit 25. Or send. Further, the inter-communication control unit 27 sends the parameters stored in the parameter storage unit 28, the parameters received from the external control communication unit 26, the parameters received from the correction coefficient calculation unit 25, etc. to the control terminals 21, 22, and 23. To the entire display device array 500.

  Hereinafter, the coordinates (position) of the display device 100 on the multi-screen 10 </ b> A are also referred to as “coordinates Pd”. Hereinafter, the pixel in the first row and the first column on the screen 10 is also referred to as an “upper left pixel”. The upper left pixel is the pixel at the left end of the screen 10 and the pixel at the upper end of the screen 10. That is, the coordinate Pd is the coordinate of the upper left pixel on the screen 10 of the display device 100.

  The display control device 200 manages the coordinates Pd of the plurality of display devices 100 on the multi-screen 10A. Specifically, the parameter storage unit 28 of the display control device 200 further stores the coordinates Pd of each of the plurality of display devices 100 constituting the entire display device array 500.

  Although the details will be described later, the correction coefficient calculation unit 25 is a calculation unit that calculates various correction coefficients.

  Next, a process (hereinafter also referred to as “initial adjustment process”) performed by the display system 1000 at the time of initial installation (initial adjustment) will be described. In the initial adjustment process, first, the display control device 200 sets an ID for each display device 100 so that the display control device 200 individually controls the display device 100. Since the process for setting the ID is a well-known process, description thereof is omitted. Thereby, as shown in FIG. 1, IDs 1 to 36 are set in 36 display devices 100.

  Next, the display control device 200 is set to associate the ID of each display device 100 with the coordinate Pd of the display device 100 (upper left pixel). Hereinafter, the position of the pixel in the horizontal direction on the multi-screen 10A is also referred to as “position h” or “h”. A value from 0 to 1919 is set in “h”. In the following, the position of the pixel in the vertical direction on the multi-screen 10A is also referred to as “position v” or “v”. A value from 0 to 1079 is set in “v”. In the following, the coordinates (positions) of the pixels on the multi-screen 10A are expressed as “coordinates (h, v)” or “(h, v)”.

  Here, the horizontal pixel size of the screen 10 of each display device 100 is expressed as hsize (= 320), and the vertical pixel size of the screen 10 is expressed as vsize (= 180). In the following, ID (ID number) is expressed as “*”. In the following, the coordinates Pd (the coordinates of the upper left pixel) of the display device 100 whose ID is “*” are expressed as “ID * (h, v)”. ID * (h, v) associates ID with the coordinates Pd (the coordinates of the upper left pixel) of the display device 100 (hereinafter also referred to as “ID corresponding coordinates”). In this case, ID * (h, v), which is an ID corresponding coordinate, is expressed as follows.

ID1 (0,0), ID2 (0, vsize), ID3 (0,2 × vsize),..., ID6 (0,5 × vsize),
ID7 (hsize, 0), ID8 (hsize, vsize), ID9 (hsize, 2 × vsize),..., ID12 (hsize, 5 × vsize),
ID13 (2 × hsize, 0), ID14 (2 × hsize, vsize), ID15 (2 × hsize, 2 × vsize),..., ID18 (2 × hsize, 5 × vsize),
ID19 (3 × hsize, 0), ID20 (3 × hsize, vsize), ID21 (3 × hsize, 2 × vsize),..., ID24 (3 × hsize, 5 × vsize),
ID25 (4 × hsize, 0), ID26 (4 × hsize, vsize), ID27 (4 × hsize, 2 × vsize),..., ID30 (4 × hsize, 5 × vsize),
ID31 (5 × hsize, 0), ID32 (5 × hsize, vsize), ID33 (5 × hsize, 2 × vsize),..., ID36 (5 × hsize, 5 × vsize)
As described above, the setting of the ID (ID number) of each display device 100 and the setting for associating the ID of each display device 100 with the coordinates Pd (the coordinates of the upper left pixel) of the display device 100 for the display control device 200 are described. did.

  Next, an individual information acquisition process is performed. In the individual information acquisition process, the display control device 200 transmits an individual information request instruction for acquiring individual information of each display device 100 to all the display device arrays 500. All display device arrays 500 transmit the individual information data to display control device 200 in accordance with the individual information request instruction. The individual information data is data indicating the ID (ID number) of each display device 100 and the individual information of the display device 100 in association with each other.

  When the display control device 200 receives the individual information data, the parameter storage unit 28 stores the ID corresponding coordinates and the individual information of each display device 100 in association with each other. For example, the parameter storage unit 28 associates and stores the individual information of the display device 100 whose ID is 2 and ID2 (0, vsize) which is the ID corresponding coordinate. That is, the display control device 200 manages a plurality of pieces of individual information corresponding to the plurality of display devices 100.

  Next, coefficient luminance acquisition processing is performed. In the coefficient luminance acquisition process, the display control device 200 transmits a coefficient luminance request instruction for acquiring the individual luminance correction coefficient and the correction luminance of each display device 100 to all the display device arrays 500. When all the display device arrays 500 receive the coefficient luminance request instruction, each display device 100 transmits the individual luminance correction coefficient and the corrected luminance of each reference color corresponding to each pixel of the display device 100 to the display control device 200. . Thereby, the display control device 200 acquires the individual luminance correction coefficient and the corrected luminance of each reference color corresponding to each pixel of each display device 100. That is, the display control apparatus 200 acquires a plurality of individual luminance correction coefficients and a plurality of corrected luminances.

  Next, a coefficient calculation process is performed. In the coefficient calculation process, the correction coefficient calculation unit 25 of the display control device 200 calculates a correction coefficient based on the plurality of acquired correction luminances. The correction coefficient is a coefficient for reflecting a plurality of correction luminances in correction of video data to be corrected. The correction of video data to be corrected is a luminance correction process described later.

  Then, the correction coefficient calculation unit 25 calculates an initial luminance correction coefficient at the time of initial adjustment of each display device 100 based on the plurality of acquired individual luminance correction coefficients and the calculated plurality of correction coefficients. That is, the correction coefficient calculation unit 25 calculates initial luminance correction coefficients for m pixels constituting the multi-screen 10A.

  Hereinafter, the initial luminance correction coefficients of the R, G, and B components of the pixel (LED5) are also referred to as “initial luminance correction coefficients Cr0, Cg0, Cb0”. Further, in the following, the initial luminance correction coefficients Cr0, Cg0, Cb0 of the pixel (LED5) specified by the coordinates (h, v) are set as initial luminance correction coefficients Cr0 (h, v), Cg0 (h, v), This is expressed as Cb0 (h, v).

  Hereinafter, a method for calculating the initial luminance correction coefficient will be described in detail. As described above, the ID is expressed as “*”. Here, the individual luminance correction coefficients of the respective display devices 100 acquired by the display control device 200 are expressed as ID * _Cr (uh, uv), ID * _Cg (uh, uv), ID * _Cb (uh, uv). . Further, the corrected luminance of each display device 100 acquired by the display control device 200 is expressed as ID * Yr_min, ID * Yg_min, ID * Yb_min.

  Hereinafter, the minimum value of the plurality of correction luminances in all the display devices 100 constituting the entire display device array 500 is also referred to as “minimum correction luminance”. The minimum correction luminance is expressed as Unit_Yr_min, Unit_Yg_min, Unit_Yb_min.

In this case, initial luminance correction coefficients Cr0 (h, v), Cg0 (h, v), and Cb0 (h, v) of m pixels are represented by the following equations.
[1] Initial luminance correction coefficient Cr0 (h, v) = ID1_Cr (h, v) × Unit_Yr_min / ID1_Yr_min for h = 0 to 319 and v = 0 to 179
Cg0 (h, v) = ID1_Cg (h, v) × Unit_Yg_min / ID1_Yg_min
Cb0 (h, v) = ID1_Cb (h, v) × Unit_Yb_min / ID1_Yb_min
[2] Initial luminance correction coefficient Cr0 (h, v) = ID2_Cr (h, v-vsize) × Unit_Yr_min / ID2_Yr_min for h = 0 to 319 and v = 180 to 359
Cg0 (h, v) = ID2_Cg (h, v-vsize) × Unit_Yg_min / ID2_Yg_min
Cb0 (h, v) = ID2_Cb (h, v-vsize) × Unit_Yb_min / ID2_Yb_min
...
[6] Initial luminance correction coefficient Cr0 (h, v) = ID6_Cr (h, v−5 × vsize) × Unit_Yr_min / ID6_Yr_min with h = 0 to 319, v = 900 to 1079
Cg0 (h, v) = ID6_Cg (h, v-5 × vsize) × Unit_Yg_min / ID6_Yg_min
Cb0 (h, v) = ID6_Cb (h, v-5 × vsize) × Unit_Yb_min / ID6_Yb_min
[7] Initial luminance correction coefficient Cr0 (h, v) = ID7_Cr (h-hsize, v) × Unit_Yr_min / ID7_Yr_min for h = 320 to 639, v = 0 to 179
Cg0 (h, v) = ID7_Cg (h-hsize, v) × Unit_Yg_min / ID7_Yg_min
Cb0 (h, v) = ID7_Cb (h-hsize, v) × Unit_Yb_min / ID7_Yb_min
[8] Initial luminance correction coefficient Cr0 (h, v) = ID8_Cr (h−hsize, v−vsize) × unit_Yr_min / ID8_Yr_min for h = 320 to 639 and v = 180 to 359
Cg0 (h, v) = ID8_Cg (h-hsize, v-vsize) × Unit_Yg_min / ID8_Yg_min
Cb0 (h, v) = ID8_Cb (h-hsize, v-vsize) × Unit_Yb_min / ID8_Yb_min
...
[12] Initial luminance correction coefficient Cr0 (h, v) = ID12_Cr (h-hsize, v-5 × vsize) × Unit_Yr_min / ID12_Yr_min for h = 320 to 639, v = 900 to 1079
Cg0 (h, v) = ID12_Cg (h-hsize, v-5 × vsize) × Unit_Yg_min / ID12_Yg_min
Cb0 (h, v) = ID12_Cb (h-hsize, v-5 × vsize) × Unit_Yb_min / ID12_Yb_min
...
[36] Initial luminance correction coefficient Cr0 (h, v) = ID36_Cr (h-5 × hsize, v-5 × vsize) × Unit_Yr_min / ID36_Yr_min with h = 1600-1919, v = 900-1079
Cg0 (h, v) = ID36_Cg (h-5 × hsize, v-5 × vsize) × Unit_Yg_min / ID36_Yg_min
Cb0 (h, v) = ID36_Cb (h-5 × hsize, v-5 × vsize) × Unit_Yb_min / ID36_Yb_min
In the above equation, Unit_Yr_min / ID * _Yr_min, Unit_Yg_min / ID * _Yg_min, Unit_Yb_min / ID * _Yb_min correspond to the correction coefficients described above.

  Here, as an example, an R component initial luminance correction coefficient calculation method for the display device 100 having an ID of 1 will be described. Here, it is assumed that h = 0 to 319 and v = 0 to 179. The corrected luminance Yr_min of the display device 100 whose ID is 1 is expressed as corrected luminance ID1_Yr_min. In addition, the individual luminance correction coefficient Cr (uh, uv) of the R component of the display device 100 whose ID is 1 is expressed as an individual luminance correction coefficient ID1_Cr (h, v).

  First, the correction coefficient calculation unit 25 calculates the correction luminance Yr_min indicating the minimum value among the m correction luminances Yr_min acquired as the minimum correction luminance Unit_Yr_min of the R component.

  Then, the correction coefficient calculation unit 25 uses the minimum correction luminance Unit_Yr_min and the correction luminance ID1_Yr_min to calculate a correction coefficient for the R component (LED5sr) from the equation of Unit_Yr_min / ID1_Yr_min. That is, the correction coefficient is calculated based on the minimum correction luminance Unit_Yr_min obtained using m correction luminances Yr_min. That is, the correction coefficient is calculated based on m correction luminances Yr_min.

  Then, the correction coefficient calculation unit 25 multiplies the individual luminance correction coefficient ID1_Cr (h, v) by the calculated correction coefficient of the R component to thereby obtain the initial luminance correction coefficient Cr0 (h, v) of the R component (LED5sr). calculate.

  The correction coefficient calculation unit 25 calculates the initial luminance correction coefficient by multiplying the individual luminance correction coefficient by the correction coefficient as in the above formula. Then, the correction coefficient calculation unit 25 stores the calculated initial luminance correction coefficient in the parameter storage unit 28. The initial luminance correction coefficient is a coefficient for obtaining an image in which luminance variation and chromaticity variation are suppressed.

  Hereinafter, coefficients that are comprehensively calculated for all the display devices 100 and that are used to obtain an image in which luminance variation and chromaticity variation among the plurality of display devices 100 are suppressed are referred to as “total luminance correction”. Also called “coefficient”.

  Next, luminance correction processing is performed. In the luminance correction processing at the time of initial adjustment, the luminance correction unit 12 of the display control device 200 corrects the video data to be corrected using the initial luminance correction coefficient as the total luminance correction coefficient. The initial luminance correction coefficient is calculated from the individual luminance correction coefficient and the correction coefficient. That is, the luminance correction unit 12 of the display control apparatus 200 corrects the video data to be corrected based on the individual luminance correction coefficient and the correction coefficient. The video data to be corrected is video data (video Im) included in the video signal processed by the video signal processing circuit 11. The correction of the video data is performed by multiplying the luminance (gradation value) of the video data by the total luminance correction coefficient.

  Specifically, in the luminance correction process, the luminance correction unit 12, for example, sets m initial values of the R component for m gradation values (pixel values) of m pixels constituting the R image of the video Im. Multiply the brightness correction coefficient (total brightness correction coefficient). Thereby, a corrected R image is obtained. By performing such processing on the R image, G image, and B image, corrected video data (R image, G image, B image) is obtained.

  Hereinafter, the video data obtained by the luminance correction processing is also referred to as “corrected video data” or “corrected video signal”. The corrected video data is video data to be corrected that has been corrected by the luminance correction unit 12.

  Here, in each display device 100, the brightness is adjusted by the individual brightness correction coefficient so that the brightness of the plurality of LEDs 5 of each display device 100 is uniform. Therefore, if the display control device 200 performs correction using the initial luminance correction coefficient, the minimum correction luminance at the time of initial adjustment can be set as a reference for the luminance of all the display devices 100. For this reason, even if the initial luminance correction coefficient is used as the total luminance correction coefficient, it is possible to perform correction that suppresses luminance variation and chromaticity variation among the plurality of display devices 100.

  After the luminance correction processing, the display control device 200 transmits the corrected video signal (corrected video data) to the entire display device array 500 via the video output terminals 17, 18, 19 and the like. Then, display control processing is performed. In the display control process, the driving unit 4 of each display device 100 drives the plurality of LEDs 5s (LED5) based on the received corrected video signal (corrected video data).

  The corrected video signal (corrected video data) is corrected by the correction target video data (video Im) based on the individual luminance correction coefficient and the initial luminance correction coefficient (total luminance correction coefficient) calculated by the correction coefficient. Can be obtained. That is, in the display control process, the drive unit 4 of each display device 100 drives the plurality of LEDs 5s (LEDs 5) based on the correction target video data corrected based on the individual luminance correction coefficient and the correction coefficient. When the display control process ends, the initial adjustment process also ends.

  In the first embodiment, the driving unit 4 in each display device 100 drives the plurality of LEDs 5s (LED5) by the PWM method based on the video data value (gradation value), thereby the plurality of LEDs 5s (LED5s). ) Is controlled. Thereby, the video based on the corrected video data is displayed on the multi-screen 10A. Since the PWM method is a well-known technique, it will be briefly described below.

  FIG. 5 is a diagram illustrating an example of PWM driving. FIG. 5 shows a state in which the basic period of PWM is a period of one frame period or less of the video signal. Further, the pulse width 1 in FIG. 5 shows a state where the duty ratio of the pulse width is, for example, 85%. The pulse width 2 in FIG. 5 shows a state where the duty ratio of the pulse width is 80%, for example.

  In this way, the drive unit 4 changes the duty ratio of the pulse width, that is, the lighting period and the extinguishing period per unit time for each LED 5 s of the LED 5. Thereby, the brightness | luminance of each LED5s of LED5 seen from human eyes can be adjusted.

  In the luminance correction, the luminance can be adjusted by the drive unit 4 changing the duty ratio of the pulse width. In this case, the luminance correction unit 12 changes the luminance value, whereby the duty ratio of the pulse width, that is, the lighting period and the extinguishing period per unit time is changed for each LED 5, and as a result, the luminance of the LED 5 is different for each LED 5. To be adjusted.

  FIG. 6 is a diagram showing the relationship between the cumulative lighting time and the luminance maintenance rate corresponding to the luminance for the green (G) LED 5 sg in the LED 5. As shown in FIG. 6, the luminance maintenance rate of the LED 5sg decreases as the cumulative lighting time becomes longer. FIG. 6 shows the luminance maintenance ratio of the green (G) LED 5 sg, but the luminance of the red (R) LED 5 sr and the blue (B) LED 5 sb similarly decreases as the cumulative lighting time increases ( Not shown).

  In the following, the maximum luminance of the LED whose accumulated lighting time is 0 is also referred to as “initial luminance Y0”. The maximum luminance is the maximum luminance that can be expressed by the LED. The luminance maintenance rate corresponds to the ratio of the maximum luminance of the LED in a state where the cumulative lighting time is larger than 0 with respect to the initial luminance Y0. Hereinafter, the luminance maintenance rate of the LED 5 sr is also referred to as “R luminance maintenance rate”. Hereinafter, the luminance maintenance rate of the LED 5 sg is also referred to as “G luminance maintenance rate”. Hereinafter, the luminance maintenance rate of the LED 5 sb is also referred to as “B luminance maintenance rate”.

  As shown in FIG. 6, the luminance of the LED 5s decreases as the cumulative lighting time increases. In view of this, in the first embodiment, the luminance of each LED 5s (LED 5) is corrected based on the accumulated lighting time.

  First, the cumulative lighting time and brightness of each LED 5 s of the LED 5 having characteristics equivalent to the characteristics of the LED 5 are measured in advance by the operator. Thereafter, based on the measurement result, a table Tb1 as shown in FIG. 7 is created in advance. The table Tb1 is stored in advance in the parameter storage unit 28. Note that the luminance maintenance ratio may be calculated using an approximate expression for calculating the luminance maintenance ratio with respect to the cumulative lighting time instead of the table Tb1.

  The accumulated lighting time of each LED 5s of all the LEDs 5 of all the display device arrays 500 is stored in the lighting time storage unit 24 of the display control device 200 of FIG. 4 every elapse of a certain unit time. Here, it is assumed that the unit time is 1 hour and the duty ratio of the pulse width for driving the LED 5s is 10%. In this case, the lighting time of 0.1 hour is added to the accumulated lighting time stored in the lighting time storage unit 24 every time one hour has passed. In the first embodiment, the cumulative lighting time is calculated based on the video data output from the luminance correction unit 12 in FIG.

  Here, it is assumed that the gradation value of R (red) of a specific pixel in the video indicated by the video data is a value corresponding to a duty ratio of 10%. In this case, 0.1 hour is added to the cumulative lighting time corresponding to R (LED5sr) of the specific pixel.

  Note that the method for calculating the cumulative lighting time is not limited to a method using video data. For example, each display device 100 manages the accumulated point time of each LED 5 s included in the display device 100, and every accumulated point time managed by each display device 100 every predetermined time. May be transmitted to the display control apparatus 200.

  The correction coefficient calculation unit 25 calculates the luminance maintenance rate of each of the plurality of LEDs 5s based on the cumulative lighting time of the plurality of LEDs 5s included in each display device 100. Specifically, the correction coefficient calculation unit 25 calculates the luminance maintenance rate of each LED 5s based on the cumulative lighting time of all the LEDs 5s stored in the lighting time storage unit 24 and the table Tb1. Note that the approximate expression described above may be used instead of the table Tb1 for calculating the luminance maintenance ratio.

  Hereinafter, the R luminance maintenance ratio, the G luminance maintenance ratio, and the B luminance maintenance ratio are also referred to as luminance maintenance ratios Pr, Pg, and Pb, respectively. In the following, the luminance maintenance rates Pr, Pg, and Pb of the pixel (LED 5) specified by the coordinates (h, v) are represented by Pr (h, v), Pg (h, v), and Pb (h, respectively. , V).

  Hereinafter, the actual luminance of the LED when the cumulative lighting time of the LED is greater than 0 is also referred to as “actual luminance Y1”. In the following, the ratio (relative value) of the actual luminance Y1 to the initial luminance Y0 is also referred to as “actual luminance relative value”. The actual luminance relative value is a value serving as an index indicating the actual luminance of the LED.

  Hereinafter, the actual luminance relative value of the LED 5 sr is also referred to as “Qr”. In the following, the actual luminance relative value of the LED 5 sg is also referred to as “Qg”. In the following, the actual luminance relative value of the LED 5sb is also referred to as “Qb”. In the following, the actual luminance relative values Qr, Qg, and Qb of the pixel (LED5) specified by the coordinates (h, v) are respectively represented by Qr (h, v), Qg (h, v), and Qb ( h, v).

  There are initial luminance variations in the plurality of LEDs 5 (LEDs). Therefore, initial brightness correction using the initial brightness correction coefficients Cr0 (h, v), Cg0 (h, v), and Cb0 (h, v) is performed. In this initial luminance correction, the actual luminance relative value in consideration of the luminance maintenance rate is expressed by the following equation 2.

  The correction coefficient calculation unit 25 calculates the actual luminance relative values Qr (h, v), Qg (h, v), and Qb (h, v) using the above equation 2. Thereafter, the correction coefficient calculation unit 25 calculates the minimum value Qrgb_min of the actual luminance relative value in all the R, G, and B pixels. The minimum value Qrgb_min is the smallest value of all Qr (h, v), all Qg (h, v), and all Qb (h, v).

  Hereinafter, the coefficients for correcting the initial luminance variation of the plurality of LEDs 5 (LEDs) and the luminance decrease due to the cumulative lighting time are also referred to as “non-initial luminance correction coefficients Cr1, Cg1, Cb1”. In the following, the non-initial luminance correction coefficients Cr1, Cg1, and Cb1 of the pixel (LED5) specified by the coordinates (h, v) are referred to as non-initial luminance correction coefficients Cr1 (h, v), Cg1 (h, v ), Cb1 (h, v). (H, v) indicates the coordinates (position) of the pixel in the multi-screen 10A as described above.

  Then, the correction coefficient calculation unit 25 uses the actual luminance relative values Qr (h, v), Qg (h, v), Qb (h, v), and the minimum value Qrgb_min to calculate a non-initial Luminance correction coefficients Cr1 (h, v), Cg1 (h, v), and Cb1 (h, v) are calculated.

  As described above, the correction coefficient calculation unit 25 calculates the luminance maintenance rate of each LED 5 s included in each LED 5 of the display device 100 based on the cumulative lighting time of all the display devices 100.

  Then, the correction coefficient calculation unit 25 uses Expression 2 and Expression 3 to convert the initial luminance correction coefficients Cr0 (h, v), Cg0 (h, v), and Cb0 (h, v) to all the display devices 100. Are changed to non-initial luminance correction coefficients Cr1 (h, v), Cg1 (h, v), and Cb1 (h, v). Note that the plurality of luminance maintenance rates are calculated using a plurality of cumulative lighting times. That is, the correction coefficient calculation unit 25 sets the initial luminance correction coefficients Cr0 (h, v), Cg0 (h, v), and Cb0 (h, v) as the non-initial luminance correction coefficients Cr1 based on the plurality of cumulative lighting times. Change to (h, v), Cg1 (h, v), Cb1 (h, v).

  Here, for example, the non-initial luminance correction coefficient Cr1 (h, v) in Expression 3 is expressed as Qrgb_min × Cr0 (h, v) / Pr (h, v) by Expression 2. Qrgb_min is the minimum value of the actual luminance relative value Qr (h, v) in all the R, G, and B pixels. Further, Qr (h, v) is a value calculated based on the luminance maintenance rate Pr (h, v) of the R component as shown in Equation 2. Therefore, Qrgb_min is a value based on the luminance maintenance rate of the R component of all pixels.

  The initial luminance correction coefficient Cr0 (h, v) is calculated by the individual luminance correction coefficient × correction coefficient. That is, the non-initial luminance correction coefficient Cr1 is a coefficient calculated based on the luminance maintenance ratio of the R component of all pixels, the individual luminance correction coefficient, and the correction coefficient.

  In the luminance correction processing considering the cumulative lighting time, the luminance correction unit 12 corrects the video data to be corrected using the non-initial luminance correction coefficient as the total luminance correction coefficient. That is, the luminance correction unit 12 corrects the video data to be corrected based on the individual luminance correction coefficient, the correction coefficient, and the plurality of cumulative lighting times.

  Further, as described above, the plurality of luminance maintenance rates are calculated using a plurality of cumulative lighting times. In other words, in the luminance correction process considering the cumulative lighting time, the luminance correction unit 12 corrects the video data to be corrected based on the individual luminance correction coefficient, the correction coefficient, and the plurality of luminance maintenance rates.

  The video data to be corrected is video data (video Im) included in the video signal processed by the video signal processing circuit 11. The correction of the video data is performed by multiplying the luminance (gradation value) of the video data by the total luminance correction coefficient (non-initial luminance correction coefficient). Since the detailed description of the luminance correction processing has been described above, it will be omitted.

  Note that the calculation of the non-initial luminance correction coefficients Cr1 (h, v), Cg1 (h, v), Cb1 (h, v) and the luminance correction processing may be performed every fixed time period (for example, 100 hours). It may be performed when a decrease in luminance occurs. For example, the latest Qrgb_min is 10% or more lower than the Qrgb_min at the previous correction when the luminance is reduced.

  In all display device arrays 500 operated in this way, the correction operation is performed according to the energization time, so that the entire luminance of the multi-screen 10A is maintained uniform. However, some display devices 100 included in the entire display device array 500 may fail while the entire display device array 500 is operated for a long period of time. In this case, it is necessary to restore the entire display device array 500 by replacing the failed display device 100 with another new display device 100.

  Hereinafter, the display device 100 that needs to be replaced with another new display device 100 among the plurality of display devices 100 included in the entire display device array 500 is also referred to as an “original display device”. The original display device is, for example, the failed display device 100. In the following, the new display device 100 to be exchanged with the original display device is also referred to as “exchange display device”.

  Here, it is assumed that the failed display device 100 has been replaced with a replacement display device in a state where the entire display device array 500 has been in operation for a long time. In this case, the cumulative lighting time of each LED of the replacement display device is clearly different from the cumulative lighting time of the LEDs of the other display devices 100.

  As shown in FIG. 6, the LED luminance maintenance rate decreases as the cumulative lighting time increases. Therefore, the cumulative lighting time of each LED of the replacement display device is short. Moreover, the brightness maintenance rate of each LED of the replacement display device is higher than the brightness maintenance rate of each LED of the other display device 100.

  Next, a process (hereinafter, also referred to as “exchange corresponding process”) performed when the original display device is replaced with a replacement display device in all display device array 500 will be described. Hereinafter, the individual information of the original display device is also referred to as “original individual information”. Hereinafter, the individual information of the replacement display device is also referred to as “new individual information”.

  In the exchange handling process, the exchange display device transmits new individual information of the exchange display device to the display control device 200. The control circuit 13 of the display control device 200 replaces the original individual information stored in the parameter storage unit 28 with the received new individual information. That is, the control circuit 13 changes the original individual information to new individual information. Further, the control circuit 13 sets the ID of the original display device in the replacement display device.

  As described above, the display control device 200 (parameter storage unit 28) manages (stores) the individual information of the plurality of display devices 100. The display control device 200 detects that any one of the plurality of display devices 100 has been replaced with another display device 100 based on any change in the plurality of individual information.

  For example, the control circuit 13 of the display control device 200 detects that the original individual information included in the plurality of individual information stored in the parameter storage unit 28 has changed to new individual information, so that the original display device It is detected that the exchange display device has been exchanged. That is, the control circuit 13 detects the replacement display device newly connected to the entire display device array 500. When the original individual information is changed to new individual information, the control circuit 13 cannot acquire the original individual information.

  Note that a plurality of individual luminance correction coefficients are stored in advance in the storage unit 8 of the exchange display device. When the replacement display device is detected, the display control device 200 acquires a plurality of individual luminance correction coefficients of the replacement display device from the replacement display device.

  As described above, the display control device 200 manages the coordinates Pd of the plurality of display devices 100 on the multi-screen 10A. Hereinafter, the entire area of the exchange display device on the multi-screen 10A is also referred to as “exchange area”. When the ID of the exchange display device is 6, for example, the exchange area is a square area indicating “ID = 6” in FIG.

  Next, the display control device 200 (control circuit 13) specifies the coordinates Pd of the replacement display device on the multi-screen 10A. Then, the display control device 200 (control circuit 13) specifies the replacement area based on the coordinates Pd of the replacement display device on the multi-screen 10A.

  As described above, the parameter storage unit 28 stores the coordinates Pd of each of the plurality of display devices 100 constituting the entire display device array 500. The size of the screen 10 of the exchange display device is 320 × 180 pixels. Therefore, the control circuit 13 can specify the exchange area from the coordinates Pd of the exchange display device.

  For example, assume that the ID of the exchange display device is 1. In this case, the coordinate Pd of the exchange display device is (0, 0). Therefore, the control circuit 13 specifies a square area indicating “ID = 1” in FIG. 2 as an exchange area from the coordinates Pd (0, 0).

  As described above, the display control apparatus 200 (lighting time storage unit 24) accumulates the lighting time of each of the s LEDs 5s constituting the multi-screen 10A of the entire display device array 500 in FIG. I manage time.

  Hereinafter, the LEDs 5s included in the replacement area among the s LEDs 5s constituting the multi-screen 10A are also referred to as “replacement LEDs”. In the following, among the s LEDs 5s constituting the multi-screen 10A, the LEDs 5s other than the replacement LED are also referred to as “unreplaced LEDs”.

  Next, the display control device 200 (control circuit 13) sets the accumulated lighting time of one or more replacement LEDs (LEDs) stored in the lighting time storage unit 24 to zero. Thereafter, the display control device 200 (control circuit 13) changes the cumulative lighting time of the replacement LED according to the lighting time of the replacement LED. That is, the cumulative lighting time of the replacement LED set to zero is accumulated by the lighting time of the replacement LED. Since the process for updating the cumulative lighting time has been described above, a description thereof will be omitted.

  Hereinafter, the position of the pixel in the horizontal direction on the screen 10 of the exchange display device is also referred to as “position hn” or “hn”. A value from 0 to 319 is set in “hn”. Hereinafter, the position of the pixel in the vertical direction on the screen 10 of the exchange display device is also referred to as “position vn” or “vn”. A value from 0 to 179 is set in “vn”. In the following, the coordinates (position) of the pixel on the screen 10 of the exchange display device are expressed as “coordinate Pe (hn, vn)”, “coordinate Pe”, or “(hn, vn)”.

  The exchange display device performs a process similar to the process for calculating the initial luminance correction coefficient described above. Thus, a plurality of initial luminance correction coefficients are stored in the parameter storage unit 28 of the exchange display device. Hereinafter, the initial luminance correction coefficients of the R, G, and B components of the pixel (LED5) in the replacement display device are also referred to as “initial luminance correction coefficients Cr0, Cg0, Cb0”. In the following description, on the screen 10 of the exchange display device, the initial luminance correction coefficients Cr0, Cg0, Cb0 of the pixel (LED5) specified by the coordinates Pe (hn, vn) are set as the initial luminance correction coefficients Cr0 (hn, vn). ), Cg0 (hn, vn), Cb0 (hn, vn). A plurality of initial luminance correction coefficients Cr0 (hn, vn), Cg0 (hn, vn), and Cb0 (hn, vn) are stored in the parameter storage unit 28 of the exchange display device.

  Hereinafter, the R luminance maintenance ratio, the G luminance maintenance ratio, and the B luminance maintenance ratio of each pixel of the exchange display device are also referred to as “luminance maintenance ratios Prn, Pgn, Pbn”. In the following, on the screen 10 of the exchange display device, the R luminance maintenance rate, the G luminance maintenance rate, and the B luminance maintenance rate of the pixel specified by the coordinates Pe (hn, vn) are respectively represented by Prn (hn, vn). ), Pgn (hn, vn), Pbn (hn, vn).

  The correction coefficient calculation unit 25 calculates all the luminance maintenance rates of the replacement display device based on the cumulative lighting time of all replacement LEDs corresponding to the replacement display device stored in the lighting time storage unit 24 and the table Tb1. Prn (hn, vn), Pgn (hn, vn), and Pbn (hn, vn) are calculated. Note that the approximate expression described above may be used instead of the table Tb1 for calculating the luminance maintenance ratio.

  Further, the correction coefficient calculation unit 25 calculates the luminance maintenance rate of each non-replaced LED based on the cumulative lighting time of all unreplaced LEDs stored in the lighting time storage unit 24 and the table Tb1. .

  Hereinafter, the actual luminance relative values of the LEDs 5sr, 5sg, and 5sb of each LED 5 of the replacement display device are also referred to as “actual luminance relative values Qrn, Qgn, and Qbn”. In the following description, on the screen 10 of the replacement display device, the actual luminance relative values Qrn, Qgn, and Qbn of the pixel (LED5) specified by the coordinates Pe (hn, vn) are expressed as Qrn (hn, vn), Qgn ( hn, vn) and Qbn (hn, vn).

  As described above, there are initial luminance variations in the plurality of LEDs 5 (LEDs 5s). Therefore, initial luminance correction using the initial luminance correction coefficients Cr0 (hn, vn), Cg0 (hn, vn), and Cb0 (hn, vn) is performed. In this initial luminance correction, the actual luminance relative value in consideration of the luminance maintenance rate is expressed by the following Equation 4.

  The correction coefficient calculation unit 25 includes luminance maintenance rates Prn (hn, vn), Pgn (hn, vn), Pbn (hn, vn), and initial luminance correction coefficients Cr0 (hn, vn), Cg0 (hn, vn), Cb0. Using (hn, vn), the actual luminance relative values Qrn (hn, vn), Qgn (hn, vn), and Qbn (hn, vn) are calculated according to the above-described Expression 4. Hereinafter, among the plurality of display devices 100 constituting the entire display device array 500, the display devices 100 other than the replacement display device are also referred to as “unreplaced display devices”.

  Thereafter, the correction coefficient calculation unit 25 calculates the minimum value Qrgb_min of the actual luminance relative value in all the R, G, and B pixels of all the non-replaceable display devices. The minimum value Qrgb_min is a plurality of Qr (h, v), a plurality of Qg (h, v), and a plurality of Qb (corresponding to all the LEDs 5s included in the area other than the exchange area in the multi-screen 10A. h, v) is the smallest value.

  Hereinafter, the coefficients for correcting the initial luminance variation of the plurality of LEDs 5 (LEDs) in the replacement display device and the luminance decrease due to the cumulative lighting time are also referred to as “non-initial luminance correction coefficients Crn1, Cgn1, Cbn1”. . In the following, the non-initial luminance correction coefficients Crn1, Cgn1, and Cbn1 of the pixel (LED5) specified by the coordinates Pe (hn, vn) are set as the non-initial luminance correction coefficients Crn1 (hn, vn), Cgn1 (hn, vn), Cbn1 (hn, vn).

  Then, the correction coefficient calculation unit 25 uses the actual luminance relative values Qrn (hn, vn), Qgn (hn, vn), Qbn (hn, vn), and the calculated minimum value Qrgb_min as follows: Thus, the non-initial luminance correction coefficients Crn1 (hn, vn), Cgn1 (hn, vn), and Cbn1 (hn, vn) are calculated.

  As described above, the display control device 200 (control circuit 13) specifies the replacement area based on the coordinates Pd of the replacement display device on the multi-screen 10A. The display control device 200 (control circuit 13) sets the cumulative lighting time of one or more replacement LEDs (LEDs) corresponding to the replacement area stored in the lighting time storage unit 24 to zero.

  The correction coefficient calculation unit 25 calculates the luminance maintenance rate of all the replacement LEDs corresponding to the replacement display device. Further, the correction coefficient calculation unit 25 calculates the luminance maintenance rate of each unreplaced LED based on the cumulative lighting time of all unreplaced LEDs and the table Tb1.

  Then, the correction coefficient calculation unit 25 uses Expression 4 and Expression 5 to calculate the initial luminance correction coefficients Cr0, Cg0, and Cb0 of the exchange display device based on the luminance maintenance rates Prn, Pgn, and Pbn of the exchange display device. The non-initial luminance correction coefficients are changed to Crn1, Cgn1, and Cbn1.

  In the luminance correction processing considering the cumulative lighting time and the exchange display device, the luminance correction unit 12 uses the non-initial luminance correction coefficients Crn1, Cgn1, and Cbn1 as total luminance correction coefficients, and corrects video data to be corrected. to correct. Since the detailed description of the luminance correction processing has been described above, it will be omitted.

  In the present embodiment, the original individual information is changed to new individual information (the original individual information cannot be acquired), so that the control circuit 13 of the display control device 200 replaces the original display device with the replacement display device. However, the present invention is not limited to this. For example, when the individual information of each display device 100 stored in advance in the parameter storage unit 28 does not match the individual information of each display device 100 that is periodically updated, the original display device is replaced with a replacement display device. It may be determined that

(Summary of Embodiment 1)
As described above, according to the present embodiment, the specific display device 100 transmits the first corrected luminance to the display control device 200. The other display device 100 transmits the second corrected luminance to the display control device 200. The calculation unit 25 of the display control device 200 uses a correction coefficient for reflecting the first correction luminance and the second correction luminance in the correction of the video data to be corrected based on the first correction luminance and the second correction luminance. To calculate.

  The correction coefficient is a coefficient for reflecting the first correction luminance and the second correction luminance in the correction of the video data to be corrected. That is, the correction coefficient is a coefficient used in correcting video data. The correction coefficient is calculated based on the first correction luminance and the second correction luminance. Therefore, the configuration for calculating the correction coefficient used in the correction of the video data based on the first correction luminance and the second correction luminance is a configuration for correcting the video data based on the plurality of correction luminances. Equivalent to. Therefore, it is possible to provide a display system 1000 having a configuration for correcting video data based on a plurality of corrected luminances.

  In the present embodiment, in the adjustment process before the display system 1000 as a product is shipped from the factory, the individual luminance correction coefficient and the correction luminance for making the luminance and chromaticity uniform are displayed for each display device 100. Is set. The individual luminance correction coefficient and the corrected luminance for each pixel are stored in the storage unit 8 of each display device 100.

  Then, at the time of initial installation in which the entire display device array 500 is configured by combining a plurality of display devices 100, the display control device 200 uses the corrected luminance acquired from all the display devices 100 constituting the entire display device array 500. Based on this, a correction coefficient is calculated. Then, the display control device 200 corrects the video signal used for display of each display device 100 based on the correction coefficient and the individual luminance correction coefficients acquired from all the display devices 100. Thereby, the brightness | luminance of each LED5 can be adjusted so that the brightness dispersion | variation between the some display apparatuses 100, etc. may be suppressed.

  In the present embodiment, the display control device 200 manages the accumulated lighting time obtained by accumulating the lighting times of the s LEDs 5s constituting the multi-screen 10A. Further, the brightness of each LED 5s is corrected based on the accumulated lighting time so that the brightness on the multi-screen 10A becomes uniform. Thereby, even after the initial installation of the display system 1000, the luminance variation among the plurality of display devices 100 can be suppressed.

  In the present embodiment, the display control device 200 manages the individual information of all the display devices 100. Accordingly, when the failed original display device is replaced with a replacement display device during the operation of the display system 1000, the display control device 200 detects that the original display device has been replaced with the replacement display device. Can do.

  In the present embodiment, the display control device 200 manages the cumulative lighting time of each of the s LEDs 5s constituting the multi-screen 10A. When the original display device is replaced with the replacement display device, the cumulative lighting time of the replacement LED (LED 5s) corresponding to the replacement area corresponding to the coordinates of the replacement display device is set to zero.

  Further, the display control device 200 acquires the individual luminance correction coefficient stored in advance in the storage unit 8 of the replacement display device from the replacement display device. Then, the display control device 200 resets the target luminance and the target chromaticity based on the cumulative lighting time of all the non-replaced display devices. Thereby, the brightness | luminance and chromaticity of an exchange display apparatus are adjusted automatically so that the target brightness | luminance and chromaticity of all the non-exchange display apparatuses may be expressed. Therefore, even after the original display device is replaced with the replacement display device, the luminance and chromaticity of all the display devices 100 including the replacement display device are kept uniform. That is, even in the state where the original display device is replaced with the replacement display device, it is possible to suppress the luminance variation among the plurality of display devices 100 including the replacement display device.

  For each display device included in the display system, luminance is measured and corrected in units of pixels in an adjustment process before the display system as a product is shipped from the factory. The chromaticity is adjusted to be uniform.

  On the other hand, in a display system that displays full HD images, it is necessary to adjust the brightness of all the display devices to be the same. Specifically, it is necessary to set the luminance of all the LEDs to the minimum luminance in consideration of the luminance variation of all the LEDs of all the display devices. The minimum luminance is the lowest luminance among the luminances of all LEDs.

  However, each display device does not necessarily include the LED having the minimum luminance. Therefore, there is a problem that the luminance at the time of initial installation of the display system is excessively lowered.

  Further, there may be a display device that cannot express the target luminance even when the luminance that is not the minimum luminance is adjusted to be the target luminance. In this case, after combining a plurality of display devices, it is necessary to adjust the luminance variation for each display device, which is troublesome.

  If the technology of the related configuration B is used, it is possible to improve the uniformity of luminance and chromaticity in units of display devices. However, the cumulative lighting time of the LED differs for each display device. As a result, the luminance maintenance rate is also different for each display device. Therefore, variations in luminance and chromaticity occur between display devices.

  Further, even if the initial luminance is set in advance and the luminance is controlled so as to maintain the initial luminance, luminance variation and color variation may occur in a display device that cannot maintain the initial luminance. In this case, there is a problem that the image quality of the image displayed by the display device is degraded. Further, when the image quality deteriorates in the display device, the display device (original display device) needs to be replaced with a new display device (replacement display device).

  When the original display device is replaced with a replacement display device, the accumulated lighting time differs between the other display devices that have been operated so far and the replacement display device. Therefore, the luminance maintenance rate is different from other display devices that have been operated so far. As a result, there is a problem that variations in luminance and chromaticity occur between display devices.

  Therefore, the display system 1000 of the present embodiment has the above configuration. Therefore, the above problem can be solved by the display system 1000 of the present embodiment.

(Function block diagram)
FIG. 8 is a block diagram showing a characteristic functional configuration of the display system BL50. The display system BL50 corresponds to the display system 1000. That is, FIG. 8 is a block diagram illustrating main functions related to the present technology among the functions of the display system BL50.

  The display system BL50 includes a plurality of display devices BL10 and a display control device BL20. Each of the plurality of display devices BL10 corresponds to the display device 100. Each of the plurality of display devices BL10 has a screen composed of a plurality of LEDs. The display control device BL20 communicates with a plurality of display devices BL10. The display control device BL20 corresponds to the display control device 200.

  Each display device BL10 has a brightness correction coefficient used for correcting the brightness of each LED, a correction brightness that is the brightness of each LED corrected by the brightness correction coefficient, and individual information of the display device BL10 Is provided. The storage unit BL1 corresponds to the storage unit 8.

  The specific display device BL10 among the plurality of display devices BL10 transmits the first correction luminance that is the correction luminance of the specific display device BL10 to the display control device BL20. Among the plurality of display devices BL10, the other display devices BL10 other than the specific display device BL10 transmit the second corrected luminance that is the corrected luminance of the other display device BL10 to the display control device BL20.

  The display control device BL20 manages a plurality of individual information corresponding to the plurality of display devices BL10. The display control device BL20 calculates a correction coefficient for reflecting the first correction luminance and the second correction luminance in the correction of the video data to be corrected based on the first correction luminance and the second correction luminance. The calculation part BL3 to perform is provided. The calculation unit BL3 corresponds to the correction coefficient calculation unit 25.

  Each display device BL10 further includes a drive unit BL2 that drives the plurality of LEDs based on the correction target video data corrected based on the luminance correction coefficient and the correction coefficient. The drive unit BL2 corresponds to the drive unit 4.

(Other variations)
Although the display system according to the embodiment of the present invention has been described above, the present invention is not limited to the embodiment. The present invention also includes modifications made to the embodiments that would occur to those skilled in the art without departing from the spirit of the present invention. That is, the present invention can be freely combined with each other within the scope of the invention, and the embodiments can be appropriately modified and omitted.

  For example, each of the display device 100 and the display control device 200 may not include all the components shown in the drawing. That is, each of display device 100 and display control device 200 only needs to include only the minimum components that can realize the effects of the present embodiment.

  Further, the function of the correction coefficient calculation unit 25 included in the display control device 200 may be realized by a processing circuit. The processing circuit calculates a correction coefficient for reflecting the first correction luminance and the second correction luminance in correction of video data to be corrected based on the first correction luminance and the second correction luminance. It is a circuit for.

  The processing circuit may be dedicated hardware. The processing circuit may be a processor that executes a program stored in the memory. The processor is, for example, a CPU (Central Processing Unit), a central processing unit, an arithmetic unit, a microprocessor, a microcomputer, a DSP (Digital Signal Processor), or the like.

  Hereinafter, the configuration in which the processing circuit is dedicated hardware is also referred to as “configuration Cs1”. In the following, the configuration in which the processing circuit is a processor is also referred to as “configuration Cs2”.

  In the configuration Cs1, the processing circuit is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof. Applicable.

  Note that a configuration in which all or a part of each component included in the display control device 200 is indicated by hardware is, for example, as follows. Hereinafter, a display control device in which all or a part of each component included in the display control device 200 is indicated by hardware is also referred to as a “display control device hd10”.

  FIG. 9 is a hardware configuration diagram of the display control device hd10. Referring to FIG. 9, the display control device hd10 includes a processor hd1 and a memory hd2. The memory hd2 is, for example, a nonvolatile or volatile semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM, or an EEPROM. Further, for example, the memory hd2 is a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD, or the like. The memory hd2 may be any storage medium used in the future.

  In the configuration Cs2, the processing circuit is the processor hd1. In the configuration Cs2, the function of the correction coefficient calculation unit 25 is realized by software, firmware, or a combination of software and firmware. Software or firmware is described as a program and stored in the memory hd2.

  In the configuration Cs2, the processing circuit (processor hd1) reads the program stored in the memory hd2 and executes the program, thereby realizing the function of the correction coefficient calculation unit 25. That is, the memory hd2 stores the following programs.

  The program calculates a correction coefficient for reflecting the first correction luminance and the second correction luminance in correction of video data to be corrected based on the first correction luminance and the second correction luminance. Is a program for causing the processing circuit (processor hd1) to execute.

  The program also causes a computer to execute a procedure of processing performed by the correction coefficient calculation unit 25, a method of executing the processing, and the like.

  As in the configuration Cs1 and the configuration Cs2, the processing circuit can realize the above-described functions by hardware, software, firmware, or the like.

  Further, the present technology may be realized as a correction coefficient calculation method in which the operation of a characteristic component included in the display control apparatus 200 is used as a step.

  Further, the present technology may be realized as a program that causes a computer to execute each step included in such a correction coefficient calculation method. Further, the present technology may be realized as a computer-readable recording medium that stores such a program. The program may be distributed via a transmission medium such as the Internet.

  All the numerical values used in the above-described embodiment are numerical values of an example for specifically explaining the present technology. That is, the present technology is not limited to each numerical value used in the above-described embodiment.

  In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

  For example, although the plurality of display devices 100 included in the entire display device array 500 are classified into three groups, the present invention is not limited to this. The plurality of display devices 100 may belong to one group. In this case, the plurality of display devices 100 are daisy chain connected by a communication cable (not shown).

  Further, for example, the resolution of the multi-screen 10A is not limited to 1920 × 1080 pixels. The resolution of the multi-screen 10A may be 3840 × 2160 pixels, for example.

  In addition, for example, the resolution of the screen 10 is not limited to 320 × 180 pixels, and other resolutions may be used.

  Although the present invention has been described in detail, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

  4, BL2 drive unit, 5, 5s, 5sb, 5sg, 5sr LED, 8, BL1 storage unit, 10 screen, 12 brightness correction unit, 25 correction coefficient calculation unit, 50 display unit, 100, BL10 display device, 200, BL20 , Hd10 display control device, 500 full display device array, 1000, BL50 display system.

Claims (9)

A display system including a plurality of display devices (100) having a screen (10) composed of a plurality of LEDs (5s) and a display control device (200) communicating with the plurality of display devices (100) ,
Each of the display devices (100)
A luminance correction coefficient for use in correcting the luminance of each LED (5s), a corrected luminance that is the luminance of each LED (5s) corrected by the luminance correction coefficient, and the display device (100) A storage unit (8) for storing individual information;
The specific display device (100) of the plurality of display devices (100) transmits the first correction luminance that is the correction luminance of the specific display device (100) to the display control device (200),
Among the plurality of display devices (100), the display device (100) other than the specific display device (100) has the second corrected luminance which is the corrected luminance of the other display device (100). Sent to the display controller (200),
The display control device (200) manages a plurality of the individual information corresponding to the plurality of display devices (100),
The display control device (200)
A calculation unit (25) that calculates a correction coefficient for reflecting the first correction luminance and the second correction luminance in correction of video data to be corrected based on the first correction luminance and the second correction luminance. With
Each of the display devices (100)
A display system further comprising: a drive unit (4) that drives the plurality of LEDs (5s) based on the correction target video data corrected based on the luminance correction coefficient and the correction coefficient. The display control device (200) includes a cumulative lighting time obtained by accumulating the lighting times of the plurality of LEDs (5s) of the specific display device (100), and the plurality of LEDs of the other display device (100). We manage other cumulative lighting time that accumulated each lighting time of LED (5s),
The display control device (200)
The luminance correction unit (12) for correcting the correction target video data based on the luminance correction coefficient, the correction coefficient, the cumulative lighting time, and the other cumulative lighting time. Display system described. The calculation unit (25) of the display control device (200) calculates the luminance maintenance rate of each of the plurality of LEDs (5s) of the specific display device (100) based on the cumulative lighting time, and Based on the other cumulative lighting time, calculate another luminance maintenance rate of each of the plurality of LEDs (5s) of the other display device (100),
The brightness correction unit (12) of the display control device (200)
The display system according to claim 2, wherein the correction target video data is corrected based on the luminance correction coefficient, the correction coefficient, the luminance maintenance ratio, and the other luminance maintenance ratio. The drive unit (4) of each display device (100) drives the plurality of LEDs (5s) based on the correction target video data corrected by the luminance correction unit (12). Or the display system of 3. The display control device (200) replaces one of the plurality of display devices (100) with a replacement display device that is another display device (100) based on any change in the plurality of individual information. The display system according to any one of claims 1 to 4, wherein the display system is detected. The plurality of display devices (100) are arranged in a matrix so that the screen (10) of the plurality of display devices (100) forms a rectangular multi-screen (10A),
The display control device (200) manages the coordinates of the plurality of display devices (100) on the multi-screen (10A),
The said display control apparatus (200) specifies the exchange area | region which is the area | region of the said whole exchange display apparatus in the said multiscreen (10A) based on the coordinate of the said exchange display apparatus in the said multiscreen (10A). Display system as described in. The display control device (200) manages the cumulative lighting time obtained by accumulating the lighting times of s (integers greater than or equal to 2) LEDs (5s) constituting the multi-screen (10A),
The display control device (200)
(A1) Of the s LEDs (5s) constituting the multi-screen (10A), the cumulative lighting time of the replacement LED that is the LED (5s) included in the replacement area is set to zero,
(A2) The display system according to claim 6, wherein the cumulative lighting time of the replacement LED is changed according to the lighting time of the replacement LED.   The display device which is any one of the plurality of display devices (100) in the display system according to any one of claims 1 to 7. A display control device (200) communicating with a plurality of display devices (100) having a screen (10) composed of a plurality of LEDs (5s),
Each display device (100) includes a brightness correction coefficient for use in correcting the brightness of each LED (5s), a corrected brightness that is the brightness of each LED (5s) corrected by the brightness correction coefficient, And storing individual information of the display device (100),
The specific display device (100) of the plurality of display devices (100) transmits the first correction luminance that is the correction luminance of the specific display device (100) to the display control device (200),
Among the plurality of display devices (100), the display device (100) other than the specific display device (100) has the second corrected luminance which is the corrected luminance of the other display device (100). Sent to the display controller (200),
The display control device (200) manages a plurality of the individual information corresponding to the plurality of display devices (100),
The display control device (200)
A calculation unit (25) that calculates a correction coefficient for reflecting the first correction luminance and the second correction luminance in correction of video data to be corrected based on the first correction luminance and the second correction luminance. With
Each of the display devices (100) drives the plurality of LEDs (5s) based on the correction target video data corrected based on the luminance correction coefficient and the correction coefficient.

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