LED Display System and LED Display Control Device

An LED display control device in an LED display system that includes a plurality of LED displays arranged in a matrix and each having a display surface, the display surfaces of the plurality of LED displays being arranged to form one screen, and the LED display control device to perform control to cause the plurality of LED displays to display video on the one screen by distributing a video signal to the plurality of LED displays,

• each of the plurality of LED displays including:
• a first display part including a plurality of first LEDs provided on the display surface;
• a second display part including at least one second LED provided on a surface different from the display surface;
• a luminance measurement part to measure a luminance of the at least one second LED;
• a first driver to drive each of the plurality of first LEDs under a first driving condition based on the video signal;
• and
• a second driver to drive the at least one second LED under one second driving condition among a plurality of second driving conditions determined in advance,
• the LED display control device comprising:
• a processor to execute a program;
• and
• a memory to store the program which, when executed by the processor, causes the processor to perform processes of
• acquiring a plurality of luminance drop characteristics by acquiring a result of measuring the luminance of the at least one second LED, each driven under different second driving conditions, from the plurality of LED displays and computing a luminance drop characteristic of the at least one second LED with respect to an accumulative lighting-up time for each of the plurality of second driving conditions determined in advance,
• correcting a luminance of the video included in the video signal for each of the plurality of first LEDs on the basis of one luminance drop characteristic among the plurality of luminance drop characteristics and the accumulative lighting-up time of each of the plurality of first LEDs,
• calculating a first luminance correction coefficient for uniformly correcting a luminance of each of the plurality of first LEDs on the one screen and further calculating a second luminance correction coefficient by correcting the first luminance correction coefficient on the basis of the accumulative lighting-up time of each of the plurality of first LEDs in the one luminance drop characteristic, and
• correcting the luminance of the video included in the video signal for each of the plurality of first LEDs by using the second luminance correction coefficient, and
• the LED display control device performs control to cause the plurality of LED displays to display the video after the correction of luminance on the one screen by distributing the video signal after the correction of the luminance to the plurality of LED displays.