WO2019092774A1 - Système d'affichage, dispositif d'affichage et dispositif de commande d'affichage - Google Patents

Système d'affichage, dispositif d'affichage et dispositif de commande d'affichage Download PDF

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Publication number
WO2019092774A1
WO2019092774A1 PCT/JP2017/040059 JP2017040059W WO2019092774A1 WO 2019092774 A1 WO2019092774 A1 WO 2019092774A1 JP 2017040059 W JP2017040059 W JP 2017040059W WO 2019092774 A1 WO2019092774 A1 WO 2019092774A1
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Prior art keywords
luminance
display
correction
display device
control device
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PCT/JP2017/040059
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English (en)
Japanese (ja)
Inventor
泰徳 和田
勲 米岡
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三菱電機株式会社
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Priority to JP2018518549A priority Critical patent/JPWO2019092774A1/ja
Priority to PCT/JP2017/040059 priority patent/WO2019092774A1/fr
Publication of WO2019092774A1 publication Critical patent/WO2019092774A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]

Definitions

  • the present invention relates to a display system having a plurality of LEDs (Light Emitting Diodes), a display device, and a display control device.
  • LEDs Light Emitting Diodes
  • LED display devices having LEDs are increasingly used for outdoor or indoor advertisement display and the like.
  • LED display devices have mainly displayed moving images of natural images and animations.
  • narrowing of the pixel pitch has progressed, for example, in LED display devices for indoor applications such as display applications in conference rooms and monitoring applications, particularly in LED applications for monitoring applications. Therefore, the visible distance of the LED display device is short.
  • a PC image close to a still image is often displayed on the LED display device.
  • the luminance reduction rates of the LEDs differ from each other depending on the content of the image, the arrangement position of the LEDs, and the like. As a result, luminance variation and color variation occur for each pixel.
  • Patent Literatures 1 and 2 disclose techniques for reducing luminance variation and color variation.
  • Patent Document 1 discloses a configuration (hereinafter, also referred to as “related configuration A”) that corrects display data based on the luminance correction coefficient of each LED included in the LED display unit.
  • Patent Document 2 discloses a configuration (hereinafter, also referred to as “related configuration B”) that corrects the luminance of the LED based on the accumulated lighting time in which the lighting time of the LED is accumulated.
  • a luminance correction coefficient is generally stored as in the related configuration A in order to suppress the luminance variation in the display device.
  • a configuration for correcting video data is required.
  • the related configurations A and B for one display device can not satisfy this requirement.
  • the present invention has been made to solve such a problem, and it is an object of the present invention to provide a display system or the like having a configuration for correcting video data based on a plurality of correction luminances.
  • a display system includes a plurality of display devices having a screen configured of a plurality of LEDs, and a display control device in communication with the plurality of display devices.
  • Each of the display devices includes a luminance correction coefficient for use in correcting the luminance of each of the LEDs, a correction luminance which is the luminance of each of the LEDs, corrected by the luminance correction coefficient, and individual information of the display devices.
  • a storage unit is provided, 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 second correction luminance, which is the correction luminance of the other display device, is transmitted to the display control device, and the display control device performs the plurality of displays.
  • the display control device manages a plurality of pieces of individual information corresponding to a device, and the display control device corrects the first correction luminance and the second correction luminance in the correction of the video data to be corrected.
  • the display unit includes a calculation unit that calculates based on the second correction luminance, and each of the display devices includes the plurality of LEDs based on the image data to be corrected that is corrected based on the luminance correction coefficient and the correction coefficient. And a drive unit for driving the drive.
  • the specific display device transmits the first correction luminance to the display control device.
  • Another display device transmits the second correction luminance to the display control device.
  • the calculation unit of the display control device generates a correction coefficient for reflecting the first correction luminance and the second correction luminance in the correction of the video data to be corrected, 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 correction of video data. Further, 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 performing correction of video data based on a plurality of correction luminances.
  • FIG. 1 is a block diagram showing a configuration of a display system according to Embodiment 1 of the present invention.
  • FIG. 1 is a front view of an entire display device array according to Embodiment 1 of the present invention.
  • FIG. 1 is a block diagram showing a configuration of a display device according to Embodiment 1 of the present invention.
  • FIG. 1 is a block diagram showing a configuration of a display control apparatus according to Embodiment 1 of the present invention. It is a figure which shows an example of the drive of a PWM system. It is a figure which shows the 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 luminance maintenance factor of red, green, blue LED with respect to the cumulative lighting time of LED. It is a block diagram showing a characteristic functional composition of a display system. It is a hardware block diagram of a display control apparatus.
  • FIG. 1 is a block diagram showing a configuration of a display system 1000 according to Embodiment 1 of the present invention.
  • the X direction and the Y direction are orthogonal to each other.
  • the X and Y directions shown in the following figures are also orthogonal to one another.
  • a direction including the X direction and a direction ( ⁇ X direction) opposite to the X direction is also referred to as “X axis direction”.
  • a direction including the Y direction and a direction ( ⁇ Y direction) opposite to the Y direction is also referred to as “Y axis direction”.
  • a plane including the X-axis direction and the Y-axis direction is also referred to as “XY plane”.
  • display system 1000 includes an entire display array 500 and a display controller 200.
  • FIG. 2 is a front view of an all-display array 500 according to Embodiment 1 of the present invention.
  • the entire display array 500 includes a plurality of display devices 100 as display units. Each of the plurality of display devices 100 has the same configuration, which will be described in detail later.
  • the entire display device array 500 is configured of 36 display devices 100 as an example.
  • 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 configured by arranging 36 display devices 100 in a matrix of 6 rows and 6 columns as shown in FIG. 1, for example.
  • An ID number is set to the 36 display devices 100.
  • the ID number is also simply referred to as "ID”.
  • FIG. 1 shows a state in which IDs of 1 to 36 are set so as not to be duplicated in 36 display devices 100.
  • the 36 display devices 100 are classified into three groups as an example so that distribution of video signals and communication of control signals can be performed efficiently.
  • all the display device array 500 is configured by display device groups G1, G2, and G3.
  • Each of the display device groups G1, G2, and G3 is configured of twelve display devices 100. Twelve display devices 100 constituting each of the display device groups G1, G2 and G3 are daisy-chained by a communication cable (not shown).
  • the order in which information (data) is transmitted in the plurality of daisy-chained display devices 100 is also referred to as “transmission order”.
  • transmission order the order in which information (data) is transmitted in the plurality of display devices 100 is defined by daisy chain connection.
  • daisy chain communication information (data) is transmitted in accordance with the transmission order in the plurality of daisy-chained display devices 100.
  • information (data) is transmitted in the transmission order according to the arrows in FIG.
  • the display device group G1 in the order of the twelve display devices 100 whose IDs are set to 6, 5, 4, 3, 2, 2, 7, 8, 9, 10, 11, 12, information is provided (Data) is transmitted.
  • the number indicating the transmission order is also referred to as “order number n” or “order number”.
  • “N” is a natural number.
  • the order number n is an order in which data is transmitted in the plurality of display devices 100 configuring each of the display device groups G1, G2, and G3.
  • 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.
  • the display device 100 in which the order number n is 1 is also referred to as “first display device”.
  • Each of the display device groups G1, G2, and G3 is configured to be communicable 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 the plurality of display devices 100 included in the all 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 in 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 shape can arrange the respective display devices 100 in a matrix.
  • Each display device 100 has a screen 10.
  • the entire display array 500 includes the multi-screen 10A.
  • the shape of the multi-screen 10A is rectangular.
  • the multi-screen 10A is parallel to the XY plane.
  • the multi-screen 10A is one screen configured by arranging a plurality of screens 10 each having a 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.
  • the screen 10 of each display device 100 is, for example, disposed on the entire front surface of the display device 100. Therefore, the shape of the multi-screen 10A of FIG. 2 is the same as the shape of the XY plane of the entire display device array 500 of FIG.
  • the plurality of display devices 100 are arranged in a matrix so that the rectangular multi-screen 10A is configured by the screens 10 of the plurality of display devices 100.
  • the all display device array 500 displays an image on the multi-screen 10A as each display device 100 displays an image on the screen 10.
  • the video shows, for example, characters, figures and the like.
  • the screen 10 is configured 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, for example, a value obtained by the equation of 320 ⁇ 180. That is, the screen 10 is configured 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 1920 ⁇ 1080. That is, the multi-screen 10A is configured of 1920 ⁇ 1080 pixels. Therefore, the multi-screen 10A can display a full HD image.
  • a display control device 200 has a function of displaying an image on the multi-screen 10A of all the 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.
  • FIG. 3 is a block diagram showing the configuration of the display device 100 according to Embodiment 1 of the present invention.
  • the order number n of the display device 100 is a natural number of 2 or more.
  • 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 which comprises the screen 10 contains LED5sr, 5sg, 5sb as a sub pixel.
  • each of red, green and blue is also referred to as a "reference color”.
  • red, green and blue are also referred to as R, G and B, respectively.
  • 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 respectively emit R light, G light, and B light.
  • 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 brightness is the brightness of the LED 5sr.
  • the G luminance is the luminance of the LED 5sg.
  • the B luminance is the luminance of the LED 5sb.
  • each of the LEDs 5sr, 5sg, and 5sb is also referred to as “LED 5s”. That is, the screen 10 is configured of (k ⁇ 3) LEDs 5s. Further, the multi-screen 10A is configured of s pieces of LEDs 5s. “S” is a value obtained by the equation 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 5sr, 5sg, 5sb.
  • the luminance of the combined light emitted from the LED 5 is also referred to as “the luminance of the LED 5”.
  • a video to be displayed on the entire multi-screen 10A is also referred to as a "video Im".
  • the image Im is represented by an R image, a G image and a B image.
  • the resolution of each of the R image, the G image and the B image is the same.
  • the R image is an image of a red component included in the image Im.
  • the G image is an image of the green component included in the image Im.
  • the B image is an image of a blue component included in the image Im.
  • the input terminal 2 receives a video signal from the display device 100 of the order number (n ⁇ 1) or the display control device 200.
  • the video signal is a signal including video data indicating a video Im to be displayed on the multi-screen 10A.
  • the video signal processing circuit 3 performs selection processing 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 among the video Im included in the video signal.
  • the video region selected by the selection process is also referred to as “partial video”.
  • the partial video is a part of the video displayed on the entire multi-screen 10A.
  • a video signal indicating a partial video is also referred to as a “partial video signal”.
  • the driving unit 4 drives the display unit 50 so that the partial video is displayed on the display unit 50 (screen 10) based on the partial video signal.
  • the driving unit 4 drives the display unit 50 by PWM (Pulse Width Modulation) method. Thereby, the brightness of the LEDs 5sr, 5sg, 5sb of the LEDs 5 included in the display unit 50 is controlled. As a result, a partial video is displayed on the display unit 50 (screen 10).
  • PWM Pulse Width Modulation
  • the terminal 6 receives a control signal from the display device 100 of the order number (n ⁇ 1) or the display control device 200.
  • 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.
  • the coefficient used to correct the luminance of the LED 5s (LED 5) is also referred to as a "luminance correction coefficient". That is, the luminance correction coefficient is a coefficient used to correct the luminance of the LED 5s (LED 5). Furthermore, in the following, the luminance correction coefficient calculated individually for each display device 100 is also referred to as an “individual luminance correction coefficient”. The individual luminance correction coefficient is a coefficient for suppressing the luminance variation and the chromaticity variation in the display device 100.
  • 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 for storing data and the like.
  • the storage unit 8 stores various parameters.
  • the storage unit 8 stores, as parameters, a plurality of individual luminance correction coefficients, a plurality of correction luminances, other necessary setting values, adjustment values, and the like.
  • the storage unit 8 also 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.
  • the individual information is information for identifying each of the plurality of display devices 100 constituting the entire display device array 500.
  • the plurality of display devices 100 constituting the all display device array 500 correspond to a plurality of individual information, respectively.
  • the individual information is, for example, a serial number.
  • the 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 centrally 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.
  • the storage unit 8 stores a plurality of individual luminance correction coefficients and a plurality of correction luminances.
  • Each individual brightness correction coefficient and each correction brightness indicate values for equalizing the brightness and the chromaticity of the partial image displayed by the display unit 50 of the display device 100 for each display device 100.
  • each individual luminance correction coefficient and each correction luminance are set to values adjusted in advance by the operator in the adjustment process before the display system 1000 as a product is shipped from the factory.
  • the worker measures and corrects the R brightness, the G brightness, and the B brightness in each pixel (LED 5) included in the display unit 50 to obtain the value of each individual brightness correction coefficient, each correction The brightness value is adjusted.
  • the storage unit 8 of each display device 100 included in the all display device array 500 stores each individual brightness correction coefficient and each correction brightness, which are individually adjusted in the display device 100.
  • the position of the pixel in the horizontal direction on the screen 10 is also referred to as “position uh” or “uh”.
  • a value of 0 to 319 is set to "uh”.
  • the position of the pixel in the vertical direction on the screen 10 is also referred to as “position uv” or “uv”. Values from 0 to 179 are set to "uv”.
  • the coordinates (position) of the pixel on the screen 10 of each display device 100 will be expressed as “coordinate Pu (uh, uv)”, “coordinate Pu” or “(uh, uv)”.
  • the R luminance, the G luminance, and the B luminance before correction in the pixel (LED 5) specified by the coordinates Pu (uh, uv) are respectively Yr (uh, uh, uv), Yg (uh, uv), Yb (uh, uv).
  • the R brightness, the G brightness, and the B brightness before the correction are respectively the R brightness, the G brightness, and the B brightness 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 combined light.
  • the minimum values of the R luminance, the G luminance, and the B luminance before correction in each display device 100 are expressed as Yr_min, Yg_min, and Yb_min, respectively.
  • LED5 which exists in coordinate Pu (uh, uv) is also called “coordinate Pu corresponding
  • 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”.
  • 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”.
  • 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”.
  • solid image of R is also referred to as "solid image Br”.
  • a G solid image is also referred to as a "solid image Bg”.
  • solid image Bb the solid image of B
  • solid image Bw a white solid image
  • the solid image Bw is expressed by the solid images Br, Bg, and Bb.
  • solid image display state the state in which the solid image Bw is displayed on the entire screen 10 is also referred to as "solid image display state".
  • the individual luminance correction coefficients Cr, Cg, Cb are coefficients for making the luminance of each LED 5 uniform in each display device 100.
  • the individual brightness correction coefficients Cr, Cg, and Cb are coefficients for making the brightness of each LED 5 expressing the solid image Bw the same in each display device 100 in the solid image display state.
  • the individual luminance correction coefficients Cr, Cg, Cb of the pixel (LED 5) specified by the coordinates Pu (uh, uv) will be described respectively as Cr (uh, uv), Cg (uh, uv), Cb Express as (uh, uv).
  • the individual luminance correction coefficients Cr (uh, uv), Cg (uh, uv), and Cb (uh, uv) are represented by the following equation 1.
  • 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 respectively Yr_min, Yg_min and Yb_min.
  • the R brightness, the G brightness and the B brightness of the LED 5 having high brightness are reduced.
  • the individual luminance correction coefficients Cr (uh, uv), Cg (uh, uv), Cb (uh, uv) of each pixel on the screen 10 as described above and the corrected luminances Yr_min, Yg_min, Yb_min. are stored in advance in the storage unit 8.
  • the communication unit 9 transmits the individual brightness correction coefficients and the correction brightness stored in the storage unit 8 to the display control device 200.
  • FIG. 4 is a block diagram showing a configuration of a display control apparatus 200 according to Embodiment 1 of the present invention.
  • the display control device 200 includes an input terminal 30, a video signal processing circuit 11, a luminance correction unit 12, a control circuit 13, video signal division and transfer units 14, 15 and 16, and video output terminals 17 and 18, And 19, an external control terminal 20, and control terminals 21, 22, and 23.
  • 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 and 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 through the video output terminals 17, 18, and 19, respectively. There is.
  • the video signal division and transfer units 14, 15, and 16 divide the video signal corrected by the luminance correction unit 12 into three video signals to be displayed by the display device groups G1, G2, and G3, respectively. Then, the video signal division and transfer units 14, 15, and 16 transmit the three divided video signals to the first display device 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.
  • PC Personal Computer
  • 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 groups G1, G2, G3 via the control terminals 21, 22, 23.
  • the control circuit 13 can control the all display device array 500 by transmitting a control signal to the all display device array 500 or receiving a control signal from the all display device array 500.
  • Control circuit 13 can control correction of the video signal in luminance correction unit 12 based on the control signal received at external control terminal 20 and the control signal transmitted from all 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 inter-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 inter-internal communication control unit 27 may be configured by hardware such as LSI (Large Scale Integration). Further, all or part of the correction coefficient calculation unit 25, the external control communication unit 26, and the inter-internal communication control unit 27 may be a module of a program executed by a processor such as a CPU.
  • LSI Large Scale Integration
  • the display control device 200 (lighting time storage unit 24) manages the accumulated lighting time obtained by accumulating the lighting times of the respective s LEDs 5s constituting the multi-screen 10A of the all display device array 500 of FIG.
  • S is an integer of 2 or more.
  • S is a value obtained by the equation 1920 ⁇ 1080 ⁇ 3.
  • the lighting time storage unit 24 stores the cumulative lighting time of the s LEDs 5s constituting the multi-screen 10A of the all display device array 500. That is, the display control device 200 manages the accumulated lighting time which is the accumulated lighting time of each of the plurality of LEDs 5s of each display device 100 included in the all display device array 500.
  • the external control communication unit 26 stores the parameter included in the control signal received by the external control terminal 20 in the parameter storage unit 28 or transmits the parameter to the inter-internal communication control unit 27. Further, the external control communication unit 26 transmits the parameter stored in the parameter storage unit 28 and the parameter received from the inter-internal communication control unit 27 to the outside through the external control terminal 20.
  • the inter-internal communication control unit 27 stores the parameters included in the control signal received by the control terminals 21, 22, 23 in the parameter storage unit 28, transmits the parameter to the external control communication unit 26, or the correction coefficient calculation unit 25. Send Further, the inter-internal communication control unit 27 controls the control terminals 21, 22, and 23 using 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, and the like. Transmit to all display array 500 via
  • the coordinates (position) of the display device 100 in the multi-screen 10A are also referred to as "coordinates Pd".
  • the pixel in the first row and the first column in the screen 10 is also referred to as “upper left pixel”.
  • the upper left pixel is a pixel at the left end of the screen 10 and is a 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 coordinates Pd of a plurality of display devices 100 in 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 all display device array 500.
  • the correction coefficient calculation unit 25 is a calculation unit that calculates various correction coefficients, the details of which will be described later.
  • the display control device 200 sets an ID in each display device 100 in order to individually control the display device 100.
  • the process of setting the ID is a well-known process, and thus the description thereof is omitted. Thereby, as shown in FIG. 1, IDs of 1 to 36 are set in the 36 display devices 100.
  • the position of the pixel in the horizontal direction on the multi-screen 10A is also referred to as "position h” or “h”. Values of 0 to 1919 are set to “h”. Also, in the following, the position of the pixel in the vertical direction in the multi-screen 10A is also referred to as “position v” or “v”. Values of 0 to 1079 are set to "v”. Also, in the following, the coordinates (position) of the pixel in the multi-screen 10A are expressed as "coordinates (h, v)" or "(h, v)".
  • ID (ID number) is expressed as "*”.
  • 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) is an ID (hereinafter also referred to as “ID-corresponding coordinate”) in which the ID is associated with the coordinate Pd of the display device 100 (the coordinate of the upper left pixel).
  • ID * (h, v) which is ID-corresponding coordinates, is expressed as follows.
  • ID1 (0, 0), ID 2 (0, vsize), ID 3 (0, 2 x vsize), ..., ID 6 (0, 5 x vsize), ID 7 (hsize, 0), ID 8 (hsize, vsize), ID 9 (hsize, 2 ⁇ vsize), ..., ID 12 (hsize, 5 ⁇ vsize), ID 13 (2 x hsize, 0), ID 14 (2 x hsize, vsize), ID 15 (2 x hsize, 2 x vsize), ..., ID 18 (2 x hsize, 5 x vsize), ID 19 (3 x hsize, 0), ID 20 (3 x hsize, vsize), ID 21 (3 x hsize, 2 x vsize), ..., ID 24 (3 x hsize, 5 x vsize), ID 25 (4 x hsize, 0), ID 26 (4 x hsize, vsize), ID 27 (4 x hsize, 2 x vsize), ..., ID 30
  • an individual information acquisition process is performed.
  • the display control device 200 transmits an individual information request instruction for acquiring the individual information of each display device 100 to the all display device array 500.
  • All display device array 500 transmits 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.
  • the parameter storage unit 28 stores the ID-corresponding coordinates of each display device 100 and the individual information in association with each other.
  • the parameter storage unit 28 associates and stores, for example, individual information of the display device 100 whose ID is 2 and ID2 (0, vsize), which are ID-corresponding coordinates. That is, the display control device 200 manages a plurality of individual information corresponding to the plurality of display devices 100.
  • coefficient luminance acquisition processing is performed.
  • the display control device 200 transmits a coefficient luminance request instruction for acquiring the individual luminance correction coefficient of each display device 100 and the corrected luminance to the all display device array 500.
  • each display device 100 transmits the individual brightness correction coefficient and the correction brightness of each reference color corresponding to each pixel of the display device 100 to display control device 200.
  • the display control device 200 acquires the individual luminance correction coefficient and the correction 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 correction luminances.
  • coefficient calculation processing is performed.
  • 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 the correction of the video data to be corrected.
  • the correction of the video data to be corrected is luminance correction processing described later.
  • 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 acquired plurality of individual luminance correction coefficients and the calculated plurality of correction coefficients. That is, the correction coefficient calculation unit 25 calculates an initial luminance correction coefficient of m pixels constituting the multi-screen 10A.
  • the initial luminance correction coefficients of the R, G, and B components of the pixel (LED 5) are also referred to as “initial luminance correction coefficients Cr0, Cg0, Cb0”. Also, in the following, the initial luminance correction coefficients Cr0, Cg0, Cb0 of the pixel (LED5) specified by the coordinates (h, v) are compared with the initial luminance correction coefficients Cr0 (h, v), Cg0 (h, v), Expressed as Cb 0 (h, v).
  • the ID is expressed as "*".
  • the individual luminance correction coefficients of each display device 100 acquired by the display control device 200 are expressed as ID * _Cr (uh, uv), ID * _Cg (uh, uv), and ID * _Cb (uh, uv).
  • the corrected luminance of each display device 100 acquired by the display control device 200 is expressed as ID * Yr_min, ID * Yg_min, and ID * Yb_min.
  • 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”. Also, the minimum correction luminance is expressed as Unit_Yr_min, Unit_Yg_min, Unit_Yb_min.
  • initial luminance correction coefficients Cr0 (h, v), Cg0 (h, v) and Cb0 (h, v) of m pixels are represented by the following equations.
  • the initial luminance correction coefficient of the R component for the display device 100 whose ID is 1 will be described.
  • the corrected brightness Yr_min of the display device 100 having an ID of 1 is expressed as a corrected brightness ID1_Yr_min.
  • the individual luminance correction coefficient Cr (uh, uv) of the R component of the display device 100 having an ID of 1 is expressed as an individual luminance correction coefficient ID1_Cr (h, v).
  • the correction coefficient calculation unit 25 calculates the correction luminance Yr_min indicating the minimum value among the acquired m correction luminances Yr_min as the minimum correction luminance Unit_Yr_min of the R component.
  • the correction coefficient calculation unit 25 calculates the correction coefficient of the R component (LED5sr) from the equation of Unit_Yr_min / ID1_Yr_min. That is, the correction coefficient is calculated by the minimum correction luminance Unit_Yr_min obtained using the m correction luminances Yr_min. That is, the correction coefficient is calculated based on the m correction luminances Yr_min.
  • 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 obtain the initial luminance correction coefficient Cr0 (h, v) of the R component (LED5sr). calculate.
  • the correction coefficient calculation unit 25 calculates an initial luminance correction coefficient by multiplying the individual luminance correction coefficient by the correction coefficient as in the above equation. 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 the luminance variation and the chromaticity variation are suppressed.
  • total luminance correction a coefficient which is a coefficient calculated comprehensively for all the display devices 100 and is a coefficient for obtaining an image in which the luminance variation and the chromaticity variation among the plurality of display devices 100 are suppressed.
  • luminance correction processing is performed.
  • 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 by the individual luminance correction coefficient and the correction coefficient. That is, the luminance correction unit 12 of the display control device 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.
  • the luminance correction unit 12 sets, for example, m initial values of the R component with respect to gradation values (pixel values) of m pixels forming the R image of the image Im.
  • the luminance correction coefficient (total luminance correction coefficient) is multiplied. Thereby, the corrected R image is obtained.
  • Such processing is performed on the R image, the G image, and the B image to obtain corrected video data (R image, G image, and B image).
  • 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 which is corrected by the luminance correction unit 12.
  • the luminance is adjusted by the individual luminance correction coefficient so that the luminance of the plurality of LEDs 5 of each display device 100 becomes uniform. Therefore, if the display control device 200 performs the correction using the initial luminance correction coefficient, the minimum correction luminance at the time of initial adjustment can be set as the reference of the luminance of all the display devices 100. Therefore, even if the initial luminance correction coefficient is used as the total luminance correction coefficient, correction can be performed to suppress the luminance variation and the chromaticity variation among the plurality of display devices 100.
  • the display control device 200 transmits the corrected video signal (corrected video data) to the all display device array 500 via the video output terminals 17, 18, 19 and the like. Then, display control processing is performed.
  • the drive unit 4 of each display device 100 drives the plurality of LEDs 5s (LEDs 5) based on the received corrected video signal (corrected video data).
  • the corrected video signal (corrected video data) is corrected for the video data (video Im) to be corrected based on the individual luminance correction coefficient and the initial luminance correction coefficient (total luminance correction coefficient) calculated by the correction coefficient.
  • 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.
  • the driving unit 4 in each display device 100 drives the plurality of LEDs 5s (LEDs 5) by the PWM method based on the video data value (gradation value), thereby the plurality of LEDs 5s (LEDs 5). ) Is controlled. As a result, a video based on the corrected video data is displayed on the multi-screen 10A.
  • the PWM method is a well-known technology, and therefore will be briefly described below.
  • FIG. 5 is a diagram showing an example of PWM method driving.
  • FIG. 5 shows a state in which the basic period of PWM is a period equal to or less than one frame period of the video signal.
  • the pulse width 1 in FIG. 5 shows that the duty ratio of the pulse width is, for example, 85%.
  • the pulse width 2 in FIG. 5 shows that the duty ratio of the pulse width is, for example, 80%.
  • the drive unit 4 changes the duty ratio of the pulse width, that is, the lighting period and the lighting-off period per unit time for each of the LEDs 5s of the LEDs 5. Thereby, the brightness of each of the LEDs 5s of the LEDs 5 viewed from human eyes can be adjusted.
  • the drive part 4 changes the duty ratio of a pulse width.
  • the duty ratio of the pulse width that is, the on period and the off period per unit time is changed for each of the LEDs 5 by changing the luminance value by the luminance correction unit 12.
  • the luminance of the LEDs 5 differs for each of the LEDs 5 To be adjusted.
  • FIG. 6 is a diagram showing the relationship between the cumulative lighting time and the luminance maintenance ratio corresponding to the luminance for the green (G) LED 5sg in the LED 5. As shown in FIG. As shown in FIG. 6, the luminance maintenance factor of the LED 5sg decreases as the accumulated lighting time increases. FIG. 6 shows the luminance maintenance ratio of the green (G) LED 5sg, but the luminance of the red (R) LED 5sr and the blue (B) LED 5sb similarly decreases as the cumulative lighting time increases ((6) Not shown).
  • the maximum luminance of the LED whose accumulated lighting time is 0 is also referred to as “initial luminance Y0”.
  • the maximum brightness is the maximum brightness that the LED can represent.
  • the luminance maintenance ratio corresponds to the ratio of the maximum luminance of the LED in which the accumulated lighting time is greater than 0 to the initial luminance Y0.
  • the luminance maintenance rate of the LED 5sr is also referred to as “R luminance maintenance rate”.
  • the luminance maintenance rate of the LED 5sg is also referred to as “G luminance maintenance rate”.
  • the brightness maintenance rate of the LED 5sb is also referred to as "B brightness maintenance rate”.
  • the luminance of the LED 5s decreases as the accumulated lighting time increases.
  • the luminance correction of each of the LEDs 5s is performed based on the accumulated lighting time.
  • the cumulative lighting time and the luminance of each of the LEDs 5s of the LEDs 5 having the same characteristics as the characteristics of the LEDs 5 are measured in advance by the worker. 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.
  • the luminance maintenance rate may be calculated using an approximate expression for calculating the luminance maintenance rate with respect to the cumulative lighting time, instead of the table Tb1.
  • the accumulated lighting time of each of the LEDs 5s of all the LEDs 5 of the all display device array 500 is stored in the lighting time storage unit 24 of the display control apparatus 200 of FIG. 4 each time a fixed unit time elapses.
  • the unit time is one hour and the duty ratio of the pulse width for driving the LED 5s is 10%.
  • the lighting time of 0.1 hour is added to the cumulative lighting time stored in the lighting time storage unit 24 every one hour.
  • the accumulated lighting time is calculated based on the video data output from the luminance correction unit 12 of FIG. 4.
  • the gradation value of R (red) of a specific pixel in the video represented by the video data is a value corresponding to a duty ratio of 10%.
  • 0.1 hour is added to the cumulative lighting time corresponding to R (LED 5sr) of the specific pixel.
  • each display device 100 manages the accumulated point etc. time of each LED 5s included in the display device 100, and every accumulated point equal time managed by each display device 100 every lapse of a 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 accumulated 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 above-described approximate expression may be used instead of the table Tb1 to calculate the luminance maintenance ratio.
  • the R brightness maintenance rate, the G brightness maintenance rate, and the B brightness maintenance rate are also referred to as brightness maintenance rates Pr, Pg, and Pb, respectively.
  • the luminance maintenance rates Pr, Pg, and Pb of the pixel (LED 5) specified by the coordinates (h, v) are Pr (h, v), Pg (h, v), Pb (h), respectively. , V).
  • the actual luminance of the LED in the state where the accumulated lighting time of the LED is larger than 0 is also referred to as “actual luminance Y1”.
  • 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.
  • the actual luminance relative value of the LED 5sr is also referred to as "Qr”.
  • the actual luminance relative value of the LED 5sg is also referred to as "Qg”.
  • the actual luminance relative value of the LED 5 sb is also referred to as “Qb”.
  • the actual luminance relative values Qr, Qg, Qb of the pixel (LED 5) specified by the coordinates (h, v) are Qr (h, v), Qg (h, v), Qb ( Express as h, v).
  • initial luminance correction is performed using the initial luminance correction coefficients Cr0 (h, v), Cg0 (h, v), and Cb0 (h, v).
  • initial luminance correction an actual luminance relative value in consideration of the luminance maintenance factor 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), Qb (h, v) using the above equation 2. After that, the correction coefficient calculation unit 25 calculates the minimum value Qrgb_min of the actual luminance relative value in all the pixels of R, G, B.
  • the minimum value Qrgb_min is the smallest value of all Qr (h, v), all Qg (h, v), and all Qb (h, v).
  • non-initial luminance correction coefficients Cr1, Cg1, Cb1 the coefficients for correcting the initial luminance variation of the plurality of LEDs 5 (LEDs 5s) and the luminance decrease due to the accumulated lighting time are also referred to as “non-initial luminance correction coefficients Cr1, Cg1, Cb1”. Further, in the following, the non-initial luminance correction coefficients Cr1, Cg1, Cb1 of the pixel (LED5) specified by the coordinates (h, v) are compared with the non-initial luminance correction coefficients Cr1 (h, v), Cg1 (h, v) And Cb1 (h, v). As described above, (h, v) indicate coordinates (positions) of pixels in the multi-screen 10A.
  • 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. The luminance correction coefficients Cr1 (h, v), Cg1 (h, v) and Cb1 (h, v) are calculated.
  • the correction coefficient calculation unit 25 calculates the luminance maintenance rate of each LED 5s included in each LED 5 of the display device 100 based on the accumulated lighting time of all the display devices 100.
  • the correction coefficient calculation unit 25 uses the equations 2 and 3 to set the initial luminance correction coefficients Cr0 (h, v), Cg0 (h, v), 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).
  • 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 brightness correction coefficients Cr0 (h, v), Cg 0 (h, v), Cb 0 (h, v) to the non-initial brightness correction coefficient Cr 1 based on the plurality of accumulated lighting times. Change to (h, v), Cg1 (h, v), Cb1 (h, v).
  • the non-initial brightness correction coefficient Cr1 (h, v) of Expression 3 is expressed by Expression 2 as Qrgb_min ⁇ Cr0 (h, v) / Pr (h, v).
  • Qrgb_min is a minimum value of actual luminance relative values Qr (h, v) in all pixels of R, G, B.
  • Qr (h, v) is a value calculated based on the luminance maintenance factor 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 the pixels.
  • the initial luminance correction coefficient Cr0 (h, v) is calculated by individual luminance correction coefficient ⁇ correction coefficient. That is, the non-initial brightness correction coefficient Cr1 is a coefficient calculated based on the brightness maintenance rate of the R component of all the pixels, the individual brightness correction coefficient, and the correction coefficient.
  • 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 accumulated lighting times.
  • the plurality of luminance maintenance rates are calculated using the plurality of accumulated lighting times. That is, in the luminance correction process in consideration of the accumulated 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 (tone value) of the video data by the total luminance correction coefficient (non-initial luminance correction coefficient).
  • the detailed description of the luminance correction processing has been described above and thus will be omitted.
  • the calculation of the non-initial brightness correction coefficients Cr1 (h, v), Cg1 (h, v), Cb1 (h, v) and the brightness correction process may be performed every predetermined time period (for example, 100 hours). It may be performed at the time of occurrence of the luminance decrease.
  • the decrease in luminance occurs, for example, when the latest Qrgb_min is reduced by 10% or more from the previous correction Qrgb_min.
  • the correction operation is performed according to the current application time, so that the entire luminance of the multi-screen 10A is maintained uniform.
  • all display device array 500 is operated for a long time, a part of display devices 100 included in the all display device array 500 may fail. 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.
  • the display device 100 that needs to be replaced with another new display device 100 is also referred to as a “original display device”.
  • the original display device is, for example, the broken display device 100.
  • the new display device 100 to be replaced with the original display device is also referred to as “replacement display device”.
  • the failed display device 100 is replaced with a replacement display device in a state where all the display device array 500 is operated for a long time.
  • the cumulative lighting time of each LED of the replacement display device is obviously different from the cumulative lighting time of the LEDs of the other display devices 100.
  • the luminance maintenance factor of the LED decreases as the accumulated lighting time is longer. Therefore, the cumulative lighting time of each LED of the replacement display device is short. Moreover, the luminance maintenance factor of each LED of the said exchange display apparatus is higher than the luminance maintenance factor of each LED of the other display apparatus 100.
  • replacement processing processing performed when the original display device is replaced with the replacement display device in all display device array 500
  • replacement processing processing performed when the original display device is replaced with the replacement display device in all display device array 500
  • original individual information the individual information of the original display device
  • new individual information the individual information of the exchange display device
  • the exchange display device transmits the 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 into new individual information. Further, the control circuit 13 sets the ID of the original display device in the replacement display device.
  • the display control device 200 (parameter storage unit 28) manages (stores) 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 a change in any of the plurality of individual information.
  • 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 the new individual information, whereby the original display device Detection of replacement with a replacement display. That is, control circuit 13 detects an exchange display device newly connected to all display device array 500. When the original individual information changes to new individual information, the control circuit 13 can not acquire the original individual information.
  • a plurality of individual luminance correction coefficients are stored in advance in the storage unit 8 of the exchange display device.
  • the display control device 200 acquires a plurality of individual luminance correction coefficients of the replacement display device from the replacement display device.
  • the display control device 200 manages the coordinates Pd of the plurality of display devices 100 in the multi-screen 10A.
  • the area of the entire exchange display device in the multi-screen 10A is also referred to as a "exchange area".
  • the display control device 200 (control circuit 13) specifies the coordinates Pd of the exchange display device in the multi-screen 10A. Then, the display control device 200 (control circuit 13) specifies the exchange area based on the coordinates Pd of the exchange display device in the multi-screen 10A.
  • 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.
  • the display control device 200 (lighting time storage unit 24) is a cumulative lighting obtained by accumulating the lighting time of each of the s LEDs 5s constituting the multi-screen 10A of the all display device array 500 of FIG. I manage time.
  • the LEDs 5s included in the replacement area are also referred to as “replacement LEDs”. Further, 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 "not-replaced LEDs”.
  • the display control device 200 sets the accumulated lighting time of one or more replacement LEDs (LEDs 5s) stored in the lighting time storage unit 24 to zero. Thereafter, the display control device 200 (control circuit 13) changes the accumulated lighting time of the replacement LED according to the lighting time of the replacement LED. That is, the accumulated lighting time of the replacement LED set to zero is accumulated for the lighting time of the replacement LED.
  • the process of updating the accumulated lighting time has been described above, and thus the description thereof is omitted.
  • 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 of 0 to 319 is set to "hn”.
  • 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”.
  • the value of 0 to 179 is set to "vn”.
  • 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 the same process as the process of calculating the initial luminance correction coefficient described above. Thereby, a plurality of initial luminance correction coefficients are stored in the parameter storage unit 28 of the exchange display device.
  • the initial luminance correction coefficients of the R, G, and B components of the pixel (LED 5) in the exchange display device are also referred to as “initial luminance correction coefficients Cr0, Cg0, Cb0”.
  • the initial luminance correction coefficients Cr0, Cg0, Cb0 of the pixel (LED5) specified by the coordinates Pe (hn, vn) are compared with the initial luminance correction coefficients Cr0 (hn, vn).
  • a plurality of initial luminance correction coefficients Cr0 (hn, vn), Cg 0 (hn, vn), Cb 0 (hn, vn) are stored in the parameter storage unit 28 of the exchange display device.
  • the R brightness maintenance rate, the G brightness maintenance rate, and the B brightness maintenance rate of each pixel of the exchange display device are also referred to as “brightness maintenance rates Prn, Pgn, Pbn”.
  • the R luminance maintaining ratio, the G luminance maintaining ratio, and the B luminance maintaining ratio of the pixel specified by the coordinates Pe (hn, vn) are Prn (hn, vn) respectively.
  • the correction coefficient calculation unit 25 is based on the cumulative lighting time of all the exchange LEDs corresponding to the exchange display device stored in the lighting time storage unit 24 and the luminance maintenance factor of the exchange display device based on the table Tb1. Prn (hn, vn), Pgn (hn, vn), Pbn (hn, vn) are calculated. Note that the above-described approximate expression may be used instead of the table Tb1 to calculate the luminance maintenance ratio.
  • correction coefficient calculation unit 25 calculates the luminance maintenance rate of each non-replacement LED based on the cumulative lighting time of all the non-replacement LEDs stored in the lighting time storage unit 24 and the table Tb1. .
  • the actual luminance relative values of the LEDs 5sr, 5sg, 5sb of the respective LEDs 5 of the replacement display device are also referred to as "actual luminance relative values Qrn, Qgn, Qbn".
  • the actual luminance relative values Qrn, Qgn, Qbn of the pixel (LED 5) specified by the coordinates Pe (hn, vn) can be expressed as Qrn (hn, vn), Qgn ( Express as hn, vn), Qbn (hn, vn).
  • the correction coefficient calculation unit 25 includes the luminance maintenance factors Prn (hn, vn), Pgn (hn, vn), Pbn (hn, vn), and the initial luminance correction coefficients Cr0 (hn, vn), Cg0 (hn, vn), Cb0.
  • the actual brightness relative values Qrn (hn, vn), Qgn (hn, vn), Qbn (hn, vn) are calculated according to the above equation 4.
  • the display devices 100 other than the replacement display device are also referred to as “non-replaced display devices”.
  • the correction coefficient calculation unit 25 calculates the minimum value Qrgb_min of the actual luminance relative value in all the pixels of R, G, B of all the non-exchanged 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 multiscreen 10A. This is the smallest value in h, v).
  • non-initial luminance correction coefficients Crn1, Cgn1, Cbn1 are also referred to as “non-initial luminance correction coefficients Crn1, Cgn1, Cbn1”.
  • the non-initial luminance correction coefficients Crn1, Cgn1 and Cbn1 of the pixel (LED5) specified by the coordinate Pe (hn, vn) are compared with the non-initial luminance correction coefficients Crn1 (hn, vn) and Cgn1 (hn, Express as vn) and Cbn1 (hn, vn).
  • the correction coefficient computing unit 25 uses the following formula 5 The non-initial brightness correction coefficients Crn1 (hn, vn), Cgn1 (hn, vn), and Cbn1 (hn, vn) are calculated.
  • the display control device 200 specifies the exchange area based on the coordinates Pd of the exchange display device in the multi-screen 10A.
  • the display control device 200 sets the accumulated lighting time of the one or more replacement LEDs (LEDs 5s) 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 rates 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 non-replacement LED based on the cumulative lighting time of all the non-replacement LEDs and the table Tb1.
  • the correction coefficient calculation unit 25 uses the equations 4 and 5 to calculate the initial luminance correction coefficients Cr0, Cg0, Cb0 of the replacement display device based on the luminance maintenance rates Prn, Pgn, Pbn of the replacement display device.
  • the non-initial brightness correction coefficients Crn1, Cgn1 and Cbn1 are changed.
  • the luminance correction unit 12 uses the non-initial luminance correction coefficients Crn1, Cgn1, and Cbn1 as the overall luminance correction coefficient, and corrects the video data to be corrected. to correct. In addition, since the detailed description of the brightness correction processing has been described above, it is omitted.
  • the control circuit 13 of the display control device 200 exchanges the original display device with the exchange display device. Have been detected (judged), but it is not limited to this.
  • 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 periodically updated, the original display device is replaced with the exchange display device. May be determined.
  • the specific display device 100 transmits the first correction luminance to the display control device 200.
  • the other display device 100 transmits the second correction luminance to the display control device 200.
  • the calculation unit 25 of the display control device 200 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. 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 correction of video data. Further, 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 performing correction of video data based on a plurality of correction luminances.
  • each display device 100 in the adjustment process before the display system 1000 as a product is shipped from the factory, individual brightness correction coefficients and correction brightness for making the brightness and the chromaticity uniform are provided for each display device 100. It is set. The individual brightness correction coefficient and the correction brightness for each pixel are stored in the storage unit 8 of each display device 100.
  • the display control device 200 uses the corrected brightness acquired from all the display devices 100 that configure the all display device array 500.
  • the correction factor is calculated based on the following.
  • the display control device 200 corrects the video signal used for the 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 luminance of each of the LEDs 5 can be adjusted so as to suppress the luminance variation and the like among the plurality of display devices 100.
  • the display control device 200 manages the accumulated lighting time in which the lighting times of the respective s LEDs 5s constituting the multi-screen 10A are accumulated. Further, correction of the brightness of each LED 5s is performed based on the accumulated lighting time so that the brightness in the multi-screen 10A becomes uniform. Thereby, even after the initial installation of the display system 1000, it is possible to suppress the luminance variation and the like among the plurality of display devices 100.
  • the display control device 200 manages individual information of all the display devices 100.
  • the display control device 200 detects that the source display device has been replaced by the replacement display device. Can.
  • the display control device 200 manages the accumulated lighting time of each of the s LEDs 5s that configure the multi-screen 10A.
  • the accumulated 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.
  • the display control device 200 acquires, from the replacement display device, the individual luminance correction coefficient stored in advance in the storage unit 8 of the replacement display device. Then, the display control device 200 resets the target luminance and the target chromaticity based on the accumulated lighting time of all the non-replacement display devices. This automatically adjusts the brightness and chromaticity of the replacement display device so as to express the target brightness and chromaticity of all non-replacement display devices. Therefore, even after the original display device is replaced with the replacement display device, the luminance and the chromaticity of all the display devices 100 including the replacement display device can be 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.
  • each display device included in the display system measurement and correction of luminance are performed in units of one pixel in an adjustment process before the display system as a product is shipped from the factory, and the luminance and The chromaticity is adjusted to be uniform.
  • the luminance of all the LEDs needs to be set to the minimum luminance.
  • the minimum luminance is the smallest of the luminances of all the LEDs.
  • each display device does not necessarily include the minimum brightness LED. Therefore, there is a problem that the luminance at the time of initial installation of the display system is excessively reduced.
  • the technology of the related configuration B it is possible to improve the uniformity of luminance and chromaticity on a display device basis.
  • the cumulative lighting time of the LEDs differs for each display device.
  • the luminance maintenance rate also differs for each display device. Therefore, variations in luminance and chromaticity occur among the display devices.
  • the accumulated lighting time is different between the other display devices operated so far and the replacement display device. Therefore, the luminance maintenance rate is different from that of the other display devices operated so far. As a result, there is a problem that variations in luminance and chromaticity occur between display devices.
  • 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.
  • FIG. 8 is a block diagram showing a characteristic functional configuration of the display system BL50.
  • Display system BL50 corresponds to display system 1000. That is, among the functions of the display system BL50, FIG. 8 is a block diagram showing main functions related to the present technology.
  • 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 configured 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 a luminance correction coefficient for use in correcting the luminance of each relevant LED, a corrected luminance which is the luminance of each relevant LED corrected with the relevant luminance correction coefficient, and individual information of the relevant display device BL10 And a storage unit BL1 that stores The storage unit BL1 corresponds to the storage unit 8.
  • the specific display device BL10 among the plurality of display devices BL10 transmits, to the display control device BL20, the first correction luminance that is the correction luminance of the specific display device BL10.
  • the display device BL10 other than the specific display device BL10 transmits the second correction luminance, which is the correction 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 a 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 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 image data to be corrected that is corrected based on the brightness correction coefficient and the correction coefficient.
  • the drive unit BL2 corresponds to the drive unit 4.
  • each of display device 100 and display control device 200 may not include all the components shown in the figure. That is, each of display device 100 and display control device 200 may include only the minimum components that can realize the effects of the present embodiment.
  • 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 the correction of the video data to be corrected based on the first correction luminance and the second correction luminance. It is a circuit for
  • the processing circuitry may be dedicated hardware.
  • the processing circuit may also be a processor that executes a program stored in the memory.
  • the processor is, for example, a central processing unit (CPU), a central processing unit, an arithmetic unit, a microprocessor, a microcomputer, a digital signal processor (DSP), or the like.
  • configuration Cs1 the configuration in which the processing circuit is dedicated hardware
  • configuration Cs2 the configuration in which the processing circuit is a processor
  • the processing circuit may be, for example, a single circuit, a complex circuit, a programmed processor, a parallel programmed processor, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or a combination thereof.
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the configuration in which all or part of the components included in the display control device 200 are indicated by hardware is, for example, as follows.
  • the display control device in which all or part of the components included in the display control device 200 are indicated by hardware is also referred to as “display control device hd10”.
  • FIG. 9 is a hardware block diagram of the display control device hd10.
  • 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 random access memory (RAM), a read only memory (ROM), a flash memory, an EPROM, or an EEPROM.
  • 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.
  • the processing circuit is processor hd1.
  • 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 written as a program and stored in the memory hd2.
  • the processing circuit (processor hd1) reads the program stored in the memory hd2 and executes the program, whereby the function of the correction coefficient calculation unit 25 is realized. That is, the memory hd2 stores the following program.
  • the program calculates a correction coefficient for reflecting the first correction luminance and the second correction luminance in the 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 the computer to execute the procedure of the process performed by the correction coefficient calculation unit 25, the method of executing the process, and the like.
  • the processing circuit can realize each of the functions described above by hardware, software, firmware or the like.
  • the present technology may be realized as a correction coefficient calculation method in which the operation of the characteristic configuration unit included in the display control device 200 is a step.
  • 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.
  • the present technology may be realized as a computer readable recording medium storing such a program.
  • the program may be distributed via a transmission medium such as the Internet.
  • the embodiment can be appropriately modified or omitted.
  • the plurality of display devices 100 included in the entire display device array 500 are classified into three groups, it is not limited thereto.
  • the plurality of display devices 100 may belong to one group.
  • the plurality of display devices 100 are daisy-chained by a communication cable (not shown).
  • the resolution of the multi-screen 10A is not limited to 1920 ⁇ 1080 pixels.
  • the resolution of the multi-screen 10A may be, for example, 3840 ⁇ 2160 pixels.
  • the resolution of the screen 10 is not limited to 320 ⁇ 180 pixels, and may be another resolution.
  • BL2 drive unit 5, 5s, 5sb, 5sg, 5sr LED, 8, BL1 storage unit, 10 screens, 12 luminance correction unit, 25 correction coefficient calculation unit, 50 display unit, 100, BL10 display device, 200, BL20 , Hd 10 Display controller, 500 all display array, 1000, BL 50 display system.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)
  • Led Devices (AREA)

Abstract

Selon l'invention, un dispositif d'affichage spécifié (100) transmet, à un dispositif de commande d'affichage (200), une première luminance de correction, c'est-à-dire la luminance de correction du dispositif d'affichage spécifié (100). Un autre dispositif d'affichage (100) transmet, au dispositif de commande d'affichage (200), une deuxième luminance de correction, c'est-à-dire la luminance de correction de l'autre dispositif d'affichage (100). En fonction de la première luminance de correction et de la deuxième luminance de correction, une unité de calcul (25) du dispositif de commande d'affichage (200) calcule des coefficients de correction pour refléter la première luminance de correction et la deuxième luminance de correction dans la correction des données d'image à corriger.
PCT/JP2017/040059 2017-11-07 2017-11-07 Système d'affichage, dispositif d'affichage et dispositif de commande d'affichage WO2019092774A1 (fr)

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PCT/JP2017/040059 WO2019092774A1 (fr) 2017-11-07 2017-11-07 Système d'affichage, dispositif d'affichage et dispositif de commande d'affichage

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WO2022177060A1 (fr) * 2021-02-18 2022-08-25 삼성전자주식회사 Dispositif d'affichage et procédé pour le commander

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WO2006100977A1 (fr) * 2005-03-23 2006-09-28 Mitsubishi Denki Kabushiki Kaisha Dispositif d’affichage
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JP2000137465A (ja) * 1998-11-04 2000-05-16 Tokyo Electron Ind Co Ltd 映像信号処理回路
JP2002023684A (ja) * 2000-07-03 2002-01-23 Mitsubishi Electric Corp 表示ユニット、表示調整装置及び表示装置
WO2006100977A1 (fr) * 2005-03-23 2006-09-28 Mitsubishi Denki Kabushiki Kaisha Dispositif d’affichage
US20120038660A1 (en) * 2010-08-12 2012-02-16 Samsung Electronics Co., Ltd. Display apparatus and image correction method of the same
JP2017032890A (ja) * 2015-08-05 2017-02-09 三菱電機株式会社 Ｌｅｄ表示装置

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Publication number Priority date Publication date Assignee Title
WO2020245981A1 (fr) * 2019-06-06 2020-12-10 三菱電機株式会社 Système d'affichage à del et dispositif d'affichage à del
WO2022177060A1 (fr) * 2021-02-18 2022-08-25 삼성전자주식회사 Dispositif d'affichage et procédé pour le commander

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