Abstract: A method for compensating a color change due to a temperature rise of an LED display module, includes obtaining temperature data measured for each of red, green and blue LEDs and luminance data measuring a luminance at a temperature; calculating a time constant of brightness relative to temperature of each of the red, green and blue LEDs according to a temperature change value using the temperature data and luminance data; calculating a rate of brightness at a current temperature relative to a normal temperature for each of the red, green and blue LEDs using the time constant calculated; calculating a color value with a color value conversion rate by setting, as a reference point, a rate of brightness of the red LED at a highest temperature relative to a normal temperature; and calculating a final brightness value compensated for each of the red, green and blue LEDs.

Abstract: The LED electronic display board system according to the present invention comprises first to Mth sub-controllers 2-1, 2-2, . . . , 2-M (here, N and M are a natural number), each of which comprises first to Nth LED modules 1-1, 1-2, . . . , 1-N, to control the first to Nth LED modules 1-1, 1-2, . . . , 1-N; and a main controller 3 which is connected to the first to Mth sub-controllers 2-1, 2-2, . . . , 2-M to control the first to Mth sub-controllers 2-1, 2-2, . . . , 2-M, wherein the first to Mth sub-controllers 2-1, 2-2, . . . , 2-M each further comprise a constant current roller 20 and a variable resistance block 21, and the constant current controller 20 adjusts a resistance value of the variable resistance block 21 according to a signal of the main controller 3 to adjust the size of current.

Abstract: The electronic display board system with a modified Ethernet network according to the present invention comprises a main controller 1 provided with a main Ethernet switch 10 comprising a first main port 101 and a second main port 102; and first to Nth display units D1, D2, . . . , DN (N is an integer of 2 or more) sequentially connected with each other by an Ethernet network to receive image data transmitted from the main controller 1 to output the data on a display module 21 or transmit the data to a neighboring display unit or the main controller 1, wherein the first to Nth display units D1, D2, . . . , DN each comprise a first sub-port 201 and a second sub-port 202 to receive a first image data transmitted from the second main port 102 to transmit the data in a forward direction and to receive a second image data transmitted from the first main port 101 to transmit the data in a reverse direction.

Abstract: The LED electronic display board system according to the present invention comprises first to Mth sub-controllers 2-1, 2-2, . . . , 2-M (here, N and M are a natural number), each of which comprises first to Nth LED modules 1-1, 1-2, . . . , 1-N, to control the first to Nth LED modules 1-1, 1-2, . . . , 1-N; and a main controller 3 which is connected to the first to Mth sub-controllers 2-1, 2-2, . . . , 2-M to control the first to Mth sub-controllers 2-1, 2-2, . . . , 2-M, wherein the first to Mth sub-controllers 2-1, 2-2, . . . , 2-M each further comprise a constant current roller 20 and a variable resistance block 21, and the constant current controller 20 adjusts a resistance value of the variable resistance block 21 according to a signal of the main controller 3 to adjust the size of current.

Abstract: The electronic display board system with a modified Ethernet network according to the present invention comprises a main controller 1 provided with a main Ethernet switch 10 comprising a first main port 101 and a second main port 102; and first to Nth display units D1, D2, . . . , DN (N is an integer of 2 or more) sequentially connected with each other by an Ethernet network to receive image data transmitted from the main controller 1 to output the data on a display module 21 or transmit the data to a neighboring display unit or the main controller 1, wherein the first to Nth display units D1, D2, . . . , DN each comprise a first sub-port 201 and a second sub-port 202 to receive a first image data transmitted from the second main port 102 to transmit the data in a forward direction and to receive a second image data transmitted from the first main port 101 to transmit the data in a reverse direction.