Color LED module board hardware components and working principle common indoor color LED module board circuit, wherein the row scanning circuit 2 74HCl38 (3-8 decoder) 4-16 decoder configuration plus more than 4953 (MOS tube ) composed of scanning 1/16. Upper and lower halves respectively, by two sets with screen 74HC595 serial shift registers for red, green display columns of input data, in 64 × 32 standard LED unit boards, each serial shift register has eight 74HC595 cascade, 4 Group share of 32 74HC595. LED light module with general resistance is mainly based on the LED lamp beads with the voltage and current to set. Now lamp beads used mainly piranhas lamp beads 5050 and 3528 SMD LED module and beads. They are basically the same voltage, white Ningxia led unit board, blue, green are 3.0V-3.4V, red and yellow are 1.8V-2.4V. With resistance at the time, in the middle choose to buy lamp beads voltage value Anhui led unit board, if bought voltage lamp beads labeled 3.0-3.2V, select voltage of 3.1V. Followed by the current, generally piranhas SMD LED lamp beads and bead current common is 20MA, but also a little better chip lamp beads can be done 25 to 30MA Jiangxi led unit board, the brightness will be better, but to a certain program Effect of light failure, because it is three chip 5050 SMD parallel package, which the current is 60MA. Kunshan led unit board, led unit board, Gao Jin photoelectric provided by Jinan Optoelectronics Technology Co., Ltd. Gao Jin. Jinan Gao Jin Optoelectronics Technology Co., Ltd. (www.gjlled.cn) strong, credible, in Jinan, Shandong liquid crystal device industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Gao Jin photoelectric and you hand into the brilliant, for a better future!